Ian P. Armstrong Meghan A. McCallister Kristina M Hyslop Adam J. Benthem 20251231 vector digital data https://doi.org/10.5066/P1EHZNHN Ian P. Armstrong Meghan A. Mccallister Kristina M. Hyslop Adam J. Benthem 2026 publication Scientific Investigations Report 2026-5116 Reston, VA U.S. Geological Survey https://doi.org/10.3133/sir20265116 This dataset consists of the vector data used to generate a flood vulnerability assessment of stream crossings in Acadia National Park, Maine. The data release file "Stream_Crossings_Acadia_NP.zip" contains a shapefile of stream crossings in Mount Desert Island, Maine. The shapefile contains information on computed flood flows, flow capacities, and an assessment of flood vulnerability. These data were compiled in cooperation with the National Park Service for assessing the erosion potential and flood vulnerability of streams and stream crossings at Acadia National Park, Maine. 20030101 20241231 publication date Complete None planned -68.4695 -68.1413 44.4504 44.2137 ISO 19115 Topic Category transportation geoscientificInformation inlandWaters USGS Thesaurus floods hazard preparedness stream reach streamflow erosion USGS Metadata Identifier USGS:69385098d4be02077d528aca Common geographic areas Acadia National Park None. Please see 'Distribution Info' for details. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Meghan A. McCallister U.S. Geological Survey Hydrologist mailing and physical

10 Bearfoot Road

Northborough MA 01532 USA (508) 490-5073 mmccallister@usgs.gov Data were processed using ArcGIS Pro 3.3.1 and Microsoft Excel V2402 in a Windows 10 64-bit environment. No formal attribute accuracy tests were conducted. The accuracy of the spatial data files is expected to have the same accuracies as the source data. No formal logical accuracy tests were conducted. The published dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal attribute accuracy tests were conducted. The accuracy of the spatial data files is expected to have the same accuracies as the source data. No formal attribute accuracy tests were conducted. The accuracy of the spatial data files is expected to have the same accuracies as the source data. Pamela J. Lombard 20201008 dataset https://www.sciencebase.gov U.S. Geological Survey https://doi.org/10.5066/p9rqppk2 Digital and/or Hardcopy 18151231 20141231 publication date Precipitation frequency grids These GIS grids were produced from National Oceanic and Atmospheric Administration (NOAA) and Northeast Regional Climate Center (NRCC) precipitation frequency estimates for North America based on precipitation data collected from 1816 to 2014. The grids provide estimated rainfall data for 2-, 5-, 10-, 25-, 50-, 100-, 200, and 500-year recurrence periods for a 24-hour duration. Grid value units are inches * 1000. Pamela J. Lombard 20201008 dataset https://www.sciencebase.gov U.S. Geological Survey https://doi.org/10.5066/p9rqppk2 Digital and/or Hardcopy 20210308 publication date Wetland Storage Raster Combined storage (palustrine, riverine, or lacustrine) data from U.S. Fish and Wildlife Service National Wetlands Inventory (NWI) - https://www.fws.gov/wetlands/, Canadian National Hydrographic Network (NHN) - http://www.snb.ca/geonb1/e/dc/catalogue-E.asp, and North American Land Change Monitoring System Landcover - https://www.mrlc.gov/data. Grid values equal to 1 are storage areas and grid values equal to 0 are NoData areas. Acadia National Park 20220901 vector digital data https://irma.nps.gov/DataStore/Reference/Profile/2182221 Digital and/or Hardcopy 20220901 publication date Hiking Trails of Acadia Contains lines representing the marked, maintained hiking trail system in Acadia National Park, Maine. Created to document the location and current trail names of the hiking trail system of Acadia National Park. Used for planning, cartography, compliance. National Park Service Karen B. Anderson 2003 vector digital data https://irma.nps.gov/DataStore/Reference/Profile/1049094 Digital and/or Hardcopy 20030101 publication date Acadia Carriage Roads Contains lines representing carriage road centerlines on Mount Desert Island, Maine, mapped with GPS. All carriage roads that were open to public use in 2003 are included; this includes carriage roads both on public (Acadia National Park) and private (Rockefeller) lands in the Towns of Bar Harbor and Mount Desert, Maine. Loraine Navarro 20080509 vector digital data Digital and/or Hardcopy 20080509 publication date Fish Passage PJT A vector shapefile containing information on 131 stream crossings gathered by field surveys with an accompanying report completed for use by Acadia National Park staff. Data obtained from Acadia National Park. North Atlantic Aquatic Connectivity Collaborative 20241223 vector digital data https://naacc.org/naacc_search_crossing.cfm Digital and/or Hardcopy 20241223 publication date NAACC Surveyed stream crossing point locations with associated survey data. Erik Martin, The Nature Conservancy 20230919 vector digital data https://geospatial.tnc.org/apps/TNC::aquatic-barrier-prioritization-northeast/about?path= Digital and/or Hardcopy 20230919 publication date TNC This dataset contains stream crossing and dam information complied as part of the North Atlantic Aquatic Connectivity Collaborative (NAACC) for the 2016 version of the Northeast Aquatic Connectivity analysis. Maine Department of Marine Resources 20230918 vector digital data https://webapps2.cgis-solutions.com/MaineStreamViewer/ Digital and/or Hardcopy 20230918 publication date MSHV Geospatial data containing information about road crossings intended to be consulted for stream restoration and conservation projects. Layer information includes basic information as well as information about habitats and species of interest. Maine Department of Transportation 20231023 vector digital data https://www.arcgis.com/home/item.html?id=617d6f95e3e947d7a0d8985ddfc028e9 Digital and/or Hardcopy 20231023 publication date MaineDOT XCulverts MaineDOT database of small culverts (structures with spans less than 5 feet or combined openings of less than 20 square feet) that run under a state roadway. Maine Department of Transportation 20231023 vector digital data https://www.arcgis.com/home/item.html?id=05e65c5a43da4f2ab29b88fb33c20a4b Digital and/or Hardcopy 20231023 publication date MaineDOT Lg Culverts MaineDOT database of large culverts (structures with spans between 5 and 10 feet or combined openings of between 20 and 80 square feet) that run under a state roadway. Maine Department of Transportation 20240102 vector digital data https://www.arcgis.com/home/item.html?id=5c884800d36a44c1872ee7e5f195245f Digital and/or Hardcopy 20240102 publication date MaineDOT Bridges MaineDOT database of bridges on public roads in Maine. The Nature Conservancy 20230918 vector digital data https://tnc.maps.arcgis.com/home/item.html?id=96e8778980be4be3979eee04165587a4#overview Digital and/or Hardcopy 20230918 publication date IFRE Culverts A database containing information about culverts, including flood risk, fish priorities, and detour length. Landscape Ecology Lab, University of Massachusetts Amherst 20220110 vector digital data http://www.umasscaps.org/data_maps/dsl.html Digital and/or Hardcopy 20220110 publication date DSL Crossings Critical Linkages data for dams and road-stream crossings as part of the Designing Sustainable Landscapes project by the Landscape Ecology Lab at the University of Massachusetts Amherst. Katie Peek (Western Carolina University); Blair Tormey (Western Carolina University); Holli Thompson (Western Carolina University); Shawn Norton (National Park Service); Julie McNamee (National Park Service) 20170301 vector digital data https://irma.nps.gov/DataStore/Reference/Profile/2272110 Digital and/or Hardcopy 20170301 publication date WCU Crossings A database of assets in Acadia National Park that includes bridges and culverts in the assessment of infrastructure to coastal hazards and climate change factors. National Park Service 2010 vector digital data Digital and/or Hardcopy 2010 observed JGrey Crossings NPS dataset including culvert locations that were mapped by Jeffrey Grey. Unpublished data furnished by Acadia National Park. National Park Service 20230417 vector digital data Digital and/or Hardcopy 20230417 observed CLR Crossings Contains linear referenced data related to historic motor roads including descriptions and assessments of culverts. Unpublished data furnished by Acadia National Park. National Park Service 20230417 tabular digital data Digital and/or Hardcopy 20230417 ground condition CLI Crossings Contains linear referenced data related to historic carriage roads including information on culverts. Unpublished data furnished by Acadia National Park. U.S. Census Bureau 2024 vector digital data https://www.census.gov/programs-surveys/geography/technical-documentation/complete-technical-documentation/tiger-geo-line.html Digital and/or Hardcopy 2024 publication date TIGER Roads Shapefile of roads used in analysis. Acadia National Park, National Park Service Emily S. Pagan Karen Anderson 20230209 vector digital data https://irma.nps.gov/DataStore/Reference/Profile/2208300 Digital and/or Hardcopy 20230209 publication date Park Boundaries Used to determine if park boundaries were within 50 feet of stream crossing. U.S. Geological Survey 20230804 vector digital data https://www.usgs.gov/national-hydrography/access-national-hydrography-products Digital and/or Hardcopy 20230804 publication date WBD Used to identify WBD Hydrologic Units that stream crossing locations fall into. United States Geological Survey 20241001 spreadsheet National Water Information System United States Geological Survey https://nwis.waterdata.usgs.gov/usa/nwis/peak/?site_no=01022840 Digital and/or Hardcopy 20070416 20230830 observed Otter Creek USGS gage (01022840) Peak flow data for Otter Creek Gage near Bar Harbor, Maine (01022840) used for computing flood flows at and around the gage. Federal Highway Administration 2012 publication Hydraulic Design 5 https://www.fhwa.dot.gov/engineering/hydraulics/pubs/12026/hif12026.pdf Digital and/or Hardcopy 2012 publication date FHWA Provides equation to calculate culvert capacity assuming inlet control Ian P. Armstrong Meghan A. McCallister Kristina M. Hyslop Adam J. Benthem 2025 raster digital data https://doi.org/10.5066/P1EHZNHN Digital and/or Hardcopy 2025 publication date Flow Accumulation Raster Flow accumulation raster from the Lidar-Derived Hydrography in Mount Desert Island, Maine child item. U.S. Geological Survey 20230302 raster digital data National Map project name for acquisition: ME Mid Coast 2021 B21 https://apps.nationalmap.gov/downloader/#/ Digital and/or Hardcopy 20210509 20210511 ground condition ME Mid Coast 2021 B21 Lidar 1-meter lidar-derived Digital Elevation Model (DEM) used for reference in this child item. Pamela J. Lombard Glenn A. Hodgkins 20201008 publication https://doi.org/10.3133/sir20205092 Digital and/or Hardcopy 20201008 publication date Maine Regional Regression Equations Flood flows along the stream network were calculated using the Maine regional regression equations reported in Table 3. Ian P. Armstrong Meghan A. McCallister Kristina M. Hyslop Adam J. Benthem 2025 vector digital data https://doi.org/10.5066/P1EHZNHN Digital and/or Hardcopy 2025 publication date Erosion Potential Index Erosion potential index values from the Erosion Potential Index of Stream Reaches in Acadia National Park, Maine child item of this data release. North Atlantic Aquatic Connectivity Collaborative 20190602 publication https://streamcontinuity.org/sites/default/files/2024-05/NAACC_Non-tidal%20Aquatic%20Assessment%20Instructions%206-2-19-UA_0.pdf Digital and/or Hardcopy 20190602 publication date NAACC Instructions for Field Data Form Definitions for information collected in stream crossing assessments in source input attribute data. 1. Input Datasets Input datasets were collected and projected to the NAD83 UTM Zone 19N coordinate system. When necessary, shapefiles were exported to include points for stream crossings. All shapefiles were merged into one dataset to identify unique culvert locations. Datasets were combined in cases where identification numbers (such as NAACC crossing codes) matched across datasets. Stream crossing locations within 100 feet of each other were manually assessed to determine if unique structures exist or if the same structure was included in multiple datasets. Duplicate points were removed. Fish Passage PJT NAACC TNC MSHV MaineDOT Lg Culverts MaineDOT XCulverts MaineDOT Bridges IFRE Culverts DSL Crossings WCU Crossings JGrey Crossings CLR Crossings CLI Crossings 20241206 2. Structure Location Adjustments. Structure point locations within 50 feet of park boundaries or along streams within the park were adjusted onto the closest intersection between the flow accumulation raster and the trail/road/carriage road network (Hiking Trails of Acadia, TIGER Roads, Acadia Carriage Roads), using scientific judgement if the adjusted location was appropriate by referencing imagery, ME Mid Coast 2021 B21 Lidar, and input structure datasets. Park Boundaries Flow Accumulation Raster Hiking Trails of Acadia TIGER Roads Acadia Carriage Roads ME Mid Coast 2021 B21 Lidar 20241206 3. Watershed Characteristics Watershed characteristics, including contributing drainage area, percent storage, and average annual precipitation were calculated at specified pour point locations, corresponding to all structure locations from Step 2. To calculate the basin characteristics, the pour points were first snapped to the flow accumulation raster using the "Snap Pour Points" tool in the ArcGIS Pro Spatial Analyst toolbox. 20241217 4. Watershed Delineation The "Watershed" tool from the ArcGIS Pro Spatial Analyst toolbox was used to delineate the upstream watershed rasters from the pour points. 20241217 5. Convert Watershed Rasters to Polygons The delineated watershed rasters were then converted to polygons using the "Raster to Polygon" tool in the ArcGIS Pro Conversion toolbox. 20241217 6. Drainage Area Calculation The drainage area of each delineated watershed polygon was then calculated using the "Calculate Geometry" tool in the ArcGIS Pro Data Management toolbox. Drainage area values were calculated in both square miles and square kilometers. 20241217 7. Wetland Storage Calculation The percent of wetland storage in the delineated watershed was calculated using the "Tabulate Area" tool in the ArcGIS Pro Spatial Analyst toolbox. The tool counted the number of storage cells in relation to the total number of cells in the delineated watersheds. Wetland Storage Raster 20241217 8. Peak Flows Calculation The peak flood flows for the estimated 2-year, 5-year, 10-year, 25-year, 50-year, 100-year, 200-year, and 500-year recurrence intervals were calculated using the Maine regional regression equations. The drainage area, percent wetland storage, and mean 24-hour precipitation variables calculated in the previous steps were input into these equations. The estimated peak flows were then rounded to three significant digits. Maine Regional Regression Equations 20241217 9. Calculated Values Attribution The calculated drainage area, percent wetland storage, mean 24-hour precipitation variables, and the estimated peak flood flows at each basin delineation pour point were joined to the stream crossing structure points using the "Spatial Join" tool in the ArcGIS Pro Analysis toolbox. These attributes are included in this shapefile. 20241217 10. Slope Calculations At each structure point, a 100-ft buffer and 50-ft buffer was created using the "Buffer" tool in the ArcGIS Pro Analysis toolbox. The "Pairwise Erase" tool in the ArcGIS Pro Analysis toolbox was used to obtain the area in between the two buffers. Flow Accumulation Raster values over 100,000 between the two buffers were extracted using the "Extract by Attributes" tool in the ArcGIS Pro Spatial Analyst toolbox. The "Int" tool in the ArcGIS Pro Spatial Analyst toolbox was used to convert Flow Accumulation Raster values to integers. The Flow Accumulation Raster was converted to polygons using the "Raster to Polygon" tool in the ArcGIS Pro Conversion toolbox. The buffer area and the Flow Accumulation polygons were intersected using "Pairwise Intersect" tool in the ArcGIS Pro Analysis toolbox. A 1-ft buffer was added using the "Pairwise Buffer" tool in the ArcGIS Pro Analysis toolbox. The "Dissolve Boundaries" tool in the ArcGIS Pro GeoAnalytics Desktop toolbox was then used on the "Pairwise Buffer" output. The "Pairwise Intersect" tool in the ArcGIS Pro Analysis toolbox was then used to combine the "Dissolve Boundaries" output and the areas between the buffers. The resulting areas were reattributed to the structure points using the "Add Join" tool in the ArcGIS Pro Data Management toolbox. If there were no Flow Accumulation cells with values of 100,000 or greater in the area between the two buffers described at the beginning of this step, the "Zonal Statistics" tool in the ArcGIS Pro Spatial Analyst toolbox was utilized to determine the top 10% of Flow Accumulation values between the buffers. The "Minus" tool in the ArcGIS Pro Spatial Analyst toolbox was used to subtract the 90% percentile Flow Accumulation values for each area from the dataset with raw Flow Accumulation values. The areas from the "Minus" output were converted to polygons using the "Raster to Polygon" ArcGIS tool. The "Select Layer by Attribute" ArcGIS Pro tool was used to select polygons with remaining Flow Accumulation values above 0, and these were exported and then buffered by 1 foot using the "Pairwise Buffer" ArcGIS Pro tool (Dissolve type: all). Slopes were calculated for the areas obtained from the areas outputted from the workflow for Flow Accumulation values above 100,000 and Flow Accumulation values below 100,000 using the ArcGIS Pro "Zonal Statistics" tool. Slope values were then joined to the structure points using the "Add Join" ArcGIS Pro tool. Flow Accumulation Raster 20241209 11. Structure Attribution and Attribute Summaries Each input dataset from Step 1 was then joined to the nearest structure point. Existing database information about each structure point was concatenated using the "Concatenate" function in the ArcGIS Pro "Calculate Field" tool in the Data Management toolbox. Data for each structure point for the Excel-based detailed NAACC were concatenated using the Excel "concatenate field" tool for the Excel-based data. Values for the Bridge Name, ANP (Acadia National Park) ID, Data Source, Condition, and Notes fields were kept as concatenated. The most recent dates obtained from the input datasets were utilized for Date Updated, Date Observed, and Date Constructed attribute fields. The maximum value was taken for Number of, dimensions, and road fill height. Values were categorized and searched to obtain crossing type, Material, Inlet Type, C Coefficient, and Y Coefficient attribute fields. 20241217 12. Inlet Area Calculations and Road Fill Height For each structure, the inlet area was calculated in Excel. This inlet area calculation was completed using the structure type to determine if an arch, pipe, or box equation should be used. The number of crossing structures was used to determine if the calculated inlet area should be multiplied to reflect multiple openings. The inlet height, width, and diameter were then used as appropriate in the following calculations: Arch inlet areas were calculated by multiplying pi by height divided by two and width divided by two. Pipe inlet areas were calculated by multiplying the pi by the culvert diameter divided by two. Box inlet areas were calculated by multiplying the height times width. If road fill height was not available in the input datasets, it was assumed and calculated to be 1.5 times the crossing opening height or diameter. 20241217 13. Stream Crossing Capacity Calculation The capacity of the stream crossing was calculated using a rearranged version of the submerged inlet control equation (FHWA) in Excel. "A' represents structure inlet area. 'D' represents interior height. 'HW' represents the depth from inlet invert to the top of the road. 'Ks' is a factor to correct for slopes (-0.5 for all crossings except for mitered inlets where it is 0.7). 'C' and 'Y' are coefficients based on the inlet type. Culvert capacity = ((AD^0.5)/Ku)*(((HW/D-K_s S-Y)/C )^0.5) FHWA 20241217 14. Flow Capacity Pass or Not Pass The stream crossing capacities were then compared to each peak flow generated in Step 5 in Excel. If the stream crossing capacity is larger than the flow, it is labelled as flows pass. If not, do not pass. The highest peak flow able to go through the stream crossing was determined. 20250106 15. Flow Vulnerability Categorization Flood vulnerabilities were assigned to the stream crossing depending on the highest peak flow able to be passed in Excel. Flood vulnerabilities were assigned as 'LOW' for crossings able to pass the 100-yr, 200-yr, or 500-yr as the highest peak flow. Flood vulnerabilities were assigned as 'Medium' for crossings able to pass the 50-yr or 25-yr as the highest peak flow. Flood vulnerabilities were assigned as 'HIGH' for crossings able to pass the 10-yr or 5-yr as the highest peak flow. Flood vulnerabilities were assigned as "VERY HIGH" for crossings able to pass the 2-yr as the highest peak flow or to stream crossings that were unable to pass all flood flows. 20250106 16. Joining Attribute Information All information computed in Excel was reattached to the culvert. This was done using "Excel to Table" tool in the ArcGIS Pro Conversion toolbox, then using the "Join Field" tool in the ArcGIS Pro Data Management toolbox. 20250106 17. Spatial Joins of Park, Road, and HUC Information Road information, HUC information, and park boundary information was added to the dataset using "Spatial Join" tool in the ArcGIS Pro Analysis toolbox. TIGER Roads Park Boundaries WBD Acadia Carriage Roads Hiking Trails of Acadia 20250106 18. Otter Creek Gage Adjustment Flood flows at the Otter Creek USGS gage (01022840) were calculated using the EMA LPII frequency analysis in the PeakFQ web application using the Expected Moments Algorithm (EMA) with peak discharges through water year 2023. The regression-equation derived flood flows at stream crossings in the Otter Creek River basin within +- 50% drainage area of the Otter Creek USGS gage were weighted with the flood flows calculated at the gage. These flows were attributed to the crossings within the Otter Creek basins, and Steps 14 and 15 were applied. Otter Creek USGS gage (01022840) 20241217 19. Erosion Potential Index Attribution Each crossing was buffered by 100 meters using the "Pairwise Buffer" tool in the ArcGIS Pro Analysis toolbox. The values from the Erosion Potential Index dataset were used to compute the minimum, maximum, and weighted average within the buffer area and are reported in the MIN_EPI, MAX_EPI, and MEAN_EPI attributes. Erosion Potential Index 20250512 Vector Point 1735 Universal Transverse Mercator 19 0.9996 -69.0 0.0 500000.0 0.0 coordinate pair 0.0000000037527980722984474 0.0000000037527980722984474 meters North American Datum 1983 Geodetic Reference System 1980 6378137.0 298.257222101 North American Vertical Datum of 1988 0.000100 meters Explicit elevation coordinate included with horizontal coordinates Stream_Crossings_Acadia_NP.shp Attribute Table Attribute table information for the point shapefile that defines the locations of the stream crossings and associated data derived in this data release. Producer Defined FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Shape type. X_Coordina X-coordinate of stream crossing location. Coordinates defining the features. 546036.1326 565401.4189 Y_Coordina Y-coordinate of stream crossing location. Coordinates defining the features. 4897644.1978 4920416.3655 Culvert_Ty Type of stream crossing. Data Source Inputs Bridge Structure definition may vary by input dataset, but in general a bridge is a stream crossing with a span of at least 20 feet. MaineDOT Culvert Structure definition may vary by input dataset, but in general a culvert is any stream crossing that is smaller than a bridge (has a span of less than 20 feet). MaineDOT Stream_Nam Name of stream, if included. Data Source Inputs << empty cell >> No values for stream names were available in input datasets. Producer defined Values refer to recorded names of streams that pass through the stream crossings, if available. Road_Type1 Type of linear transportation route that the stream crossing/culvert is under, including roads, carriage roads, and hiking trails. Producer Defined Road Structure on/near road. Producer defined Carriage Road Structure on/near carriage road. Producer defined Hiking Trail Structure on/near hiking trail. Producer defined Bridge_Nam Name of bridge. Data Source Inputs << empty cell >> Name of structure is not available. Producer defined Names of bridges, if available. NAACC_Cros Crossing code provided by the North Atlantic Aquatic Connectivity Collaborative. NAACC << empty cell >> No NAACC codes available for the particular crossing. Producer defined Crossing codes generated by the NAACC consist of "xy" plus a string of numerical digits. PMIS_Code Project Management Information System code used by National Park Service. Acadia National Park << empty cell >> Empty cell indicates that no PMIS code was available for the stream crossing. Producer defined Codes used by NPS. ANP_ID Identification used for infrastructure by the National Park Service (NPS). Acadia National Park << empty cell >> Empty cell indicates that no ANP identification code was available for the stream crossing. Producer defined Codes used for identification by NPS. MaineDOT_I Identification number used for culverts and bridges by MaineDOT. MaineDOT << empty cell >> Empty cell indicates that no MaineDOT identification code was available for the stream crossing. Producer defined Corresponds to the small culvert, cross culvert, or bridge identification number. VHB Identification of engineering drawing and page number. Acadia National Park << empty cell >> Empty cell indicates that no VHB identification of associated engineering drawings and page numbers were available for the stream crossing. Producer defined Drawing number followed by page number. Data_Sourc Refers to the data source of each stream crossing/culvert point. Values have been concatenated and separated by a hypen when stream crossing data was derived from multiple data sources. Producer Defined Data source(s) of each stream crossing/culvert point. Number_of_ The number of openings at the stream crossing. Producer Defined 1.0 4.0 Crossing_S The shape of the crossing. Producer Defined << empty cell >> No value was available in the source input data to indicate the shape of the crossing. Producer defined Arch A culvert with a rounded top and flat bottom, like a semi-circle. Producer defined Box A culvert in the shape of a rectangle. Producer defined Pipe A culvert in the shape of an oval or circle. Producer defined Culvert_Le The length of the stream crossing/culvert, measured in feet. Producer Defined << empty cell >> No value for the stream crossing/culvert length was available. Producer defined 1 272 feet Culvert_He The height of the stream crossing/culvert, measured in feet. Producer Defined << empty cell >> No value for the stream crossing/culvert length was available. Producer defined 1 20 feet Culvert_Wi The width of the stream crossing/culvert, measured in feet. Producer Defined << empty cell >> No value for the stream crossing/culvert width was available. Producer defined 1 44 feet Culvert_Di The diameter of the stream crossing/culvert, measured in feet. Producer Defined << empty cell >> No value for the stream crossing/culvert diameter was available. Producer defined 0.33 5.0 feet Culvert_Ma The material of the stream crossing/culvert. Producer Defined << empty cell >> No information on the material was available in the input datasets. Producer defined Stone Stream crossings with listed material information indicated the crossing was made of stone, granite, or masonry. Producer defined Concrete Stream crossings with listed material information indicated the crossing was made of concrete. Producer defined Metal Stream crossings with listed material information indicated the crossing was made of metal, iron, or aluminum. Producer defined Combination Stream crossings with listed material information indicated the crossing was made of a combination of materials, composite of materials, or listed multiple types of materials. Producer defined Plastic Stream crossings with listed material information indicated the crossing was made of plastic. Producer defined Wood Stream crossings with listed material information indicated the crossing was made of wood. Producer defined Clay Stream crossings with listed material information indicated the crossing was made of clay. Producer defined Inlet_Grad The grade of the stream bottom relative to the structure inlet. Producer Defined << empty cell >> No information on the inlet grade was available in the input datasets. Producer defined At Stream Grade The structure inlet and the stream bottom are at the same elevation. NAACC Instructions for Field Data Form Perched The inlet structure is significantly above the stream bottom upstream of the structure. NAACC Instructions for Field Data Form Inlet Drop The inlet structure is significantly below the stream bottom upstream of the structure. NAACC Instructions for Field Data Form Clogged/Collapsed/Submerged The structure inlet is noted as being contained full of debris, collapsed, or underwater. NAACC Instructions for Field Data Form Outlet_Gra The grade of the stream bottom relative to the structure outlet. Producer Defined << empty cell >> No information on the outlet grade was available in the input datasets. Producer defined At Stream Grade The structure outlet and the stream bottom are at the same elevation. NAACC Instructions for Field Data Form Free fall The structure outlet is significantly above the stream bottom. NAACC Instructions for Field Data Form Perched The structure outlet is significantly above the stream bottom. NAACC Instructions for Field Data Form Clogged/Collapsed/Submerged The structure outlet is noted as being contained full of debris, collapsed, or underwater. NAACC Instructions for Field Data Form Cascade The outlet of the structure is higher than the stream bottom, so that water cascades from the structure. NAACC Instructions for Field Data Form Outlet_Wid The width of the structure outlet, measured in feet. Producer Defined << empty cell >> No information on the outlet width was available in the input datasets. Producer defined 1 40 feet Outlet_Hei The width of the structure outlet, measured in feet. Producer Defined << empty cell >> No information on the outlet height was available in the input datasets. Producer defined 1 19.5 feet Inlet_Type The type of structure inlet. Producer Defined << empty cell >> No information on the inlet type was available in the input datasets. Producer defined Headwall The inlet is set flush in a vertical wall. NAACC Instructions for Field Data Form Curb type concrete The inlet of the structure is set into the concrete curb. Producer defined Drop-inlet with grate The inlet of the structure is a vertical drop into the structure, with a protective grate placed over it. Producer defined Headwall and Wingwalls The inlet is set flush in a vertical wall and contains angled walls to funnel flow into the structure. NAACC Instructions for Field Data Form Drop-inlet/Dry-laid Stone The inlet of the structure is a vertical drop into the structure and the inlet structure is composed of dry-laid stone. Producer defined Projecting The inlet of the culvert projects out from the road embankment. NAACC Instructions for Field Data Form Mitered The structure inlet is flush with the slope of the embankment. NAACC Instructions for Field Data Form Loose stones around pipe Stones found around pipe inlet. Producer defined Pipe only Pipe inlet. Producer defined Wingwall The inlet is set within angled walls meant to funnel water flow. NAACC Instructions for Field Data Form Road_Fill_ The vertical distance between the top of the crossing structure and the road surface, measured in feet. Producer Defined << empty cell >> No information on the road fill height was available in the input datasets. Producer defined 1 25 feet Condition Notes on the condition of the structure concatenated. Data Source Inputs << empty cell >> No information on the structure condition was available in the input datasets. Producer defined Information recorded by the input datasets about the condition of the culvert. Notes Notes from input datasets concatenated. Data Source Inputs << empty cell >> No "Notes" were available in the input datasets. Producer defined Any additional notes contained in the input datasets. Photograph Links or internal Acadia National Park photo references. Producer Defined << empty cell >> No information on photographs was available in the input datasets. Producer defined Link or Acadia National Park photo reference. Culvert_In The computed area of the culvert at the inlet, measured in square feet. Producer Defined -9999 No inlet area was able to be computed at this structure. Producer defined 0.09 640 square feet Inlet_Coef The type of inlet, including shape, material, and inlet entrance type. Producer Defined << empty cell >> Insufficient information on the inlet was available in the input datasets. Producer defined The type of inlet, including shape, material, and inlet entrance type, separated by spaces. C_Coeffici The C coefficient to be used in the capacity calculation. Producer Defined -9999 Insufficient information to assign a C coefficient was available in the input datasets. Producer defined 0.0 0.065 Y_Coeffici The Y coefficient to be used in the capacity calculation. Producer Defined -9999 Insufficient information to assign a C coefficient was available in the input datasets. Producer defined 0.0 0.87 Capacity The computed capacity of the culvert, assuming submerged inlet control. Producer Defined -9999 Represents a null value, where capacity was unable to be calculated due to inadequate information. Producer defined 0.23 80694 cubic feet per second Capacity_C An attributed used to indicate if there was insufficient data for the capacity calculation. Producer Defined << empty cell >> Sufficient information available to compute capacity. Producer defined insufficient data for calculation Insufficient data for the capacity calculation. Producer defined Road_Fill1 An attribute used to indicate if it was necessary to assume a road fill height in the capacity calculation. Assumed road fill height value located in Road_Fil_1. Producer Defined << empty cell >> No assumed road fill height value was needed. Producer defined Road fill height assumption made Road fill height assumption was used. Producer defined Slope_Max_ An attribute used to indicate if a slope of 15% was used if the computed slope exceeded 15%. Producer Defined << empty cell >> Calculated slope is less than 15%, calculated slope value able to be used. Producer defined Calculated channel slope exceeds 15% so assumed slope set to 15% As stated, calculated channel slope exceeds 15% so assumed slope set to 15% in capacity calculation. Producer defined Road_Fil_1 The assumed road fill height calculated. Calculated by multiplying the outlet height or diameter by 1.5. Producer Defined -9999 No road fill height assumption made due to inadequate information. Producer defined 0.0 30.0 feet Road_Fil_2 The road fill height used in the calculation. Either the value from the input datasets or the assumed road fill height. Producer Defined -9999 No road fill height due to inadequate information. Producer defined 0.0 30.0 feet Pass_2 Indicates if the computed structure capacity is great enough to allow for computed 2-yr peak flow to pass. Producer Defined -9999 Not enough information to determine if flow would be able to pass. Producer defined PASS The calculated stream crossing capacity assuming submerged inlet control is larger than the computed peak flow. Producer defined DOES NOT PASS The calculated stream crossing capacity assuming submerged inlet control is less than the computed peak flow. Producer defined Pass_5 Indicates if the computed structure capacity is great enough to allow for computed 5-yr peak flow to pass. Producer Defined -9999 Not enough information to determine if flow would be able to pass. Producer defined PASS The calculated stream crossing capacity assuming submerged inlet control is larger than the computed peak flow. Producer defined DOES NOT PASS The calculated stream crossing capacity assuming submerged inlet control is less than the computed peak flow. Producer defined Pass_10 Indicates if the computed structure capacity is great enough to allow for computed 10-yr peak flow to pass. Producer Defined -9999 Not enough information to determine if flow would be able to pass. Producer defined PASS The calculated stream crossing capacity assuming submerged inlet control is larger than the computed peak flow. Producer defined DOES NOT PASS The calculated stream crossing capacity assuming submerged inlet control is less than the computed peak flow. Producer defined Pass_25 Indicates if the computed structure capacity is great enough to allow for computed 25-yr peak flow to pass. Producer Defined -9999 Not enough information to determine if flow would be able to pass. Producer defined PASS The calculated stream crossing capacity assuming submerged inlet control is larger than the computed peak flow. Producer defined DOES NOT PASS The calculated stream crossing capacity assuming submerged inlet control is less than the computed peak flow. Producer defined Pass_50 Indicates if the computed structure capacity is great enough to allow for computed 50-yr peak flow to pass. Producer Defined -9999 Not enough information to determine if flow would be able to pass. Producer defined PASS The calculated stream crossing capacity assuming submerged inlet control is larger than the computed peak flow. Producer defined DOES NOT PASS The calculated stream crossing capacity assuming submerged inlet control is less than the computed peak flow. Producer defined Pass_100 Indicates if the computed structure capacity is great enough to allow for computed 100-yr peak flow to pass. Producer Defined -9999 Not enough information to determine if flow would be able to pass. Producer defined PASS The calculated stream crossing capacity assuming submerged inlet control is larger than the computed peak flow. Producer defined DOES NOT PASS The calculated stream crossing capacity assuming submerged inlet control is less than the computed peak flow. Producer defined Pass_200 Indicates if the computed structure capacity is great enough to allow for computed 200-yr peak flow to pass. Producer Defined -9999 Not enough information to determine if flow would be able to pass. Producer defined PASS The calculated stream crossing capacity assuming submerged inlet control is larger than the computed peak flow. Producer defined DOES NOT PASS The calculated stream crossing capacity assuming submerged inlet control is less than the computed peak flow. Producer defined Pass_500 Indicates if the computed structure capacity is great enough to allow for computed 500-yr peak flow to pass. Producer Defined -9999 Not enough information to determine if flow would be able to pass. Producer defined PASS The calculated stream crossing capacity assuming submerged inlet control is larger than the computed peak flow. Producer defined DOES NOT PASS The calculated stream crossing capacity assuming submerged inlet control is less than the computed peak flow. Producer defined Highest Indicates the highest computed peak flow able to be passed by the structure. Producer Defined -9999 Not enough information to determine maximum flow that would be able to pass. Producer defined 500 The highest peak flow able to be passed is the 500-yr flow. Producer defined 25 The highest peak flow able to be passed is the 25-yr flow. Producer defined 200 The highest peak flow able to be passed is the 200-yr flow. Producer defined 2 The highest peak flow able to be passed is the 2-yr flow. Producer defined 100 The highest peak flow able to be passed is the 100-yr flow. Producer defined 50 The highest peak flow able to be passed is the 50-yr flow. Producer defined 10 The highest peak flow able to be passed is the 10-yr flow. Producer defined 5 The highest peak flow able to be passed is the 5-yr flow. Producer defined No flows pass No peak flows were able to be passed. Producer defined Flood_Vuln Indicates the computed flood vulnerability depending on the highest peak flow able to be passed by the structure. Producer Defined LOW If the 100-yr, 200-yr, or 500-yr are the highest flows able to be passed. Producer defined MEDIUM If the 25-yr or 50-yr is the highest flow able to be passed. Producer defined HIGH If the 5-yr flood flow, or the 10-yr flood flow are the highest able to be passed. Producer defined NOT COMPUTED DUE TO INSUFFICIENT INFORMATION Information in input datasets insufficient to calculate capacity. Producer defined NOT COMPUTED DUE TO NO FLOW VALUES No flow values available at the structure. Producer defined INSUFFICIENT INFORMATION AND NO FLOW VALUES Information in input datasets insufficient to calculate capacity and no flow values available at the structure. Producer defined VERY HIGH If no flows are able to be passed or the 2-yr flood flow is the highest flow. Producer defined SQKM The computed drainage area, in square kilometers. Producer Defined 0.0 26.2 square kilometers SQMI The computed drainage area, in square miles. Producer Defined 0.0 10.1 square miles PRECIP2Y Maximum 24-hour duration precipitation for the 2-year frequency storm event. Producer Defined 0.0 3.6 inches PRECIP5Y Maximum 24-hour duration precipitation for the 5-year frequency storm event. Producer Defined 0.0 4.5 inches PRECIP10Y Maximum 24-hour duration precipitation for the 10-year frequency storm event. Producer Defined -9999 No value calculated. Producer defined 0.0 5.2 inches PRECIP25Y Maximum 24-hour duration precipitation for the 25-year frequency storm event. Producer Defined 0.0 6.2 inches PRECIP50Y Maximum 24-hour duration precipitation for the 50-year frequency storm event. Producer Defined 0.0 6.9 inches PRECIP100Y Maximum 24-hour duration precipitation for the 100-year frequency storm event. Producer Defined 0.0 7.7 inches PRECIP200Y Maximum 24-hour duration precipitation for the 200-year frequency storm event. Producer Defined 0.0 8.5 inches PRECIP500Y Maximum 24-hour duration precipitation for the 500-year frequency storm event. Producer Defined 0.0 9.6 inches MEAN_ELEV The mean elevation of the drainage area, in feet. Producer Defined 0.0 459.0 STORAGE Percentage of area of storage (lakes, ponds, reservoirs, wetlands) in contributing watershed. Producer Defined 0.0 46.1 Q_2yr The peak flood flow for the estimated 2-year recurrence interval. Flows were calculated using the Maine regional regression equations. Producer Defined 0.0 260.0 cubic feet per second Q_5yr The peak flood flow for the estimated 5-year recurrence interval. Flows were calculated using the Maine regional regression equations. Producer Defined 0.0 376.0 cubic feet per second Q_10yr The peak flood flow for the estimated 10-year recurrence interval. Flows were calculated using the Maine regional regression equations. Producer Defined 0.0 450.0 cubic feet per second Q_25yr The peak flood flow for the estimated 25-year recurrence interval. Flows were calculated using the Maine regional regression equations. Producer Defined 0.0 568.0 cubic feet per second Q_50yr The peak flood flow for the estimated 50-year recurrence interval. Flows were calculated using the Maine regional regression equations. Producer Defined 0.0 666.0 cubic feet per second Q_100yr The peak flood flow for the estimated 100-year recurrence interval. Flows were calculated using the Maine regional regression equations. Producer Defined 0.0 762.0 cubic feet per second Q_200yr The peak flood flow for the estimated 200-year recurrence interval. Flows were calculated using the Maine regional regression equations. Producer Defined 0.0 852.0 cubic feet per second Q_500yr The peak flood flow for the estimated 500-year recurrence interval. Flows were calculated using the Maine regional regression equations. Producer Defined 0.0 953.0 cubic feet per second Slope_1 The computed slope of the stream, as a ratio. Producer Defined 0 115.0 Date_Updat The date the input datasets were most recently updated. Data Source Inputs << empty cell >> No value available in the input dataset. Producer defined Date recorded in mm/dd/yyyy format. Date_Obser The most recent date the data was observed in the input datasets. Data Source Inputs << empty cell >> No value available in the input dataset. Producer defined Date recorded in mm/dd/yyyy format. Date_Const The date the structure was constructed. Data Source Inputs << empty cell >> No value available in the input dataset. Producer defined Date recorded in mm/dd/yyyy or yyyy format. HUC10 The HUC10 watershed derived from the WBD dataset. U.S. Geological Survey 0105000214 HUC10 code Producer defined 0105000215 HUC10 code Producer defined HUC12 The HUC12 watershed derived from the WBD dataset. U.S. Geological Survey 010500021408 HUC12 code Producer defined 010500021407 HUC12 code Producer defined 010500021502 HUC12 code Producer defined 010500021503 HUC12 code Producer defined 010500021501 HUC12 code Producer defined 010500021509 HUC12 code Producer defined RouteName The name of the closest trail, carriage road, or road. Data Source Inputs << empty cell >> No name available. Producer defined The name of the closest trail, carriage road, or road. Road_Info Information about the material or jurisdiction of the road. Data Source Inputs << empty cell >> No information available. Producer defined M Route type: common name road. TIGER Roads S State road. TIGER Roads unhardened Hiking trail is unhardened. Producer defined O Other road. TIGER Roads hardened Trail is hardened Producer defined CLASS Indicates if the Acadia National Park Boundaries are within 50 feet of the structure point, and what type of park ownership exists at that location. Acadia National Park << empty cell >> No ANP land within 50 feet. Acadia National Park Full (Fee) Ownership Class of Acadia National Park ownership. Acadia National Park Conservation Easement Class of Acadia National Park ownership. Acadia National Park Future Fee Acquisition Class of Acadia National Park ownership. Acadia National Park MIN_EPI The minimum Erosion Potential Index score measured within a 100-m buffer of the structure. Producer Defined -9999 A minimum EPI score was not available for the structure point. Producer defined 0.62 1.43 MAX_EPI The maximum Erosion Potential Index score measured within a 100-m buffer of the structure. Producer Defined -9999 A maximum EPI score was not available for the structure point. Producer defined 0.86 2.59 MEAN_EPI The average Erosion Potential Index score measured within a 100-m buffer of the structure. Producer Defined -9999 A mean EPI score was not available for the structure point. Producer defined 0.82 1.67 U.S. Geological Survey - ScienceBase mailing address

Denver Federal Center

Building 810

Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Digital Data https://doi.org/10.5066/P1EHZNHN None 20260225 Meghan A. McCallister U.S. Geological Survey Hydrologist mailing and physical

10 Bearfoot Road

Northborough Massachusetts 01532 USA (508) 490-5073 mmccallister@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998