U.S. Geological Survey 2012 vector digital data Open File Report 2012-1187 Reston, VA U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?ofr2012_1187_Nehalem_Wetted_Channel_and_Bar_Features_2005 Jones, Krista L. Keith, Mackenzie K. O'Connor, Jim E. Mangano, Joseph F. Wallick, J. Rose 2012 U.S. Geological Survey Open-File Report 2012-1187 Reston, Virginia U.S. Geological Survey 120 p. https://pubs.usgs.gov/of/2012/1187/ The Tillamook Bay subbasins and Nehalem River basins encompass 1,369 and 2,207 respective square kilometers of northwestern Oregon and drain to the Pacific Ocean. The Tillamook, Trask, Wilson, Kilchis, and Miami Rivers flow into Tillamook Bay near the towns of Tillamook and Garibaldi. The Wilson and Trask River basins cover the largest areas (500 and 451 square kilometers, respectively) whereas the Tillamook and Kilchis Rivers encompass similar sized areas (156 and 169 square kilometers, respectively) and the Miami River the smallest area (94 square kilometers). In cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey completed a reconnaissance-level assessment of channel condition and bed-material transport relevant to the permitting of in-stream gravel extraction along the the major alluvial portions of six river systems, including the lowermost 14.1 km of the Tillamook River, 16.3 km of the Trask River, 15.2 km of the Wilson River, 7.8 km of the Kilchis River, 11.6 km of the Miami River, and 31.4 km of the Nehalem River. To support these analyses, digital channel maps were produced to depict channel and floodplain conditions in the Tillamook Bay sub-basins and Nehalem River basin from different time periods. GIS layers defining the wetted channel and bar features and channel centerline in the study area were developed for four time periods: 1939, 1967, 2005, and 2009. For this project, the active channel was defined as area typically inundated during annual high flows, and includes the low-flow channel as well as side channels, islands, and channel-flanking gravel bars. The wetted channel and bar feature datasets were developed by digitizing from aerial photographs. Aerial photographs from 1939 and 1967 were scanned, rectified, and mosaicked for this project (See metadata for each photograph set for more information on the rectification process and resolution of each dataset). Digital orthophotographs from 2005 and 2009 are publicly available. These data were created to support preliminary assessment of channel stability and bed-material transport on Tillamook, Trask, Wilson, Kilchis, Miami, and Nehalem Rivers, northwest Oregon. This mapping was used to track changes in channel morphology and planform over time. 2005 ground condition Complete None planned -123.945707 -123.751676 45.733506 45.655135 ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Thesaurus sediment transport fluvial geomorphology historical channel change channel stability USGS Metadata Identifier USGS:094bc4da-b007-41d1-ad49-82c376b69010 Geographic Names Information System (GNIS) Miami River Oregon Coast Range Trask River Nehalem River Tillamook River Tillamook County Nehalem Bay Wilson River Tillamook Bay Kilchis River None The U.S. Geological Survey should be acknowledged as the data source in products derived from these data. U.S. Geological Survey Mackenzie Keith Hydrologist mailing

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Portland OR 97201 US 503-251-3474 mkeith@usgs.gov https://water.usgs.gov/GIS/browse/ofr2012_1187_Nehalem_Wetted_Channel_and_Bar_Features_2005.jpg Illustration of data set jpg None Unclassified None Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcGIS 10.0.5.4400 All wetted channel and bar feature mapping was reviewed by a minimum of three team members to ensure protocol was followed and that mapping was consistent between time periods. Data are topologically correct in ArcGIS. Topolgy rules were used to edit features and verify that polygons were completely enclosed or did not overlap. Data are complete. Wetted channel and bar feature mapping was reviewed by a minimum of three other team members to ensure protocol was followed and that mapping was consistent between time periods. Digitizing was done at a scale of 1:2,000 in the Tillamook Bay sub-basins and upstream of river kilometer 19.0 on the Nehalem River. Downstream of river kilometer 19.0 on the Nehalem River, digitizing was completed at a scale of 1:10,000. All bar and wetted channel features greater than 200 square meters were digitized. Because polygons were split for assignment to study reaches, some may represent areas less than 200 square meters. Best judgment was used to delineate feature boundaries where obscured by vegetation or shadows. The 1939 and 1967 photographs of the six study areas were georectified using 5 to 14 ground-control points. The total root mean square error of rectified photographs, an indicator of the horizontal position uncertainties owing to the georectification process, was less than 4.9 m for all study areas. Generally, ground-control points for georectification were located near the mainstem channels so that positional errors for channel features should be less than the root mean square error reported for individual photographs. Digitizing was done at a scale of 1:2,000 in the Tillamook Bay sub-basins and upstream of river kilometer 19.0 on the Nehalem River. Downstream of river kilometer 19.0 on the Nehalem River, digitizing was completed at a scale of 1:10,000. Wallick, J. Rose Jim E. O'Connor Anderson, Scott Keith, Mackenzie Cannon, Charles Risley, John C. 2011 U.S. Geological Survey Scientific Investigations Report 2011-5041 Reston, Virginia U.S. Geological Survey 112 p. https://pubs.usgs.gov/sir/2011/5041/ online 1939 2009 ground condition Wallick, 2011 The report describes detailed methods used in photograph rectification and mosaicking, as well as channel centerline, wetted channel, and bar feature delineation. Surdex Corporation, Chesterfield, MO 2006 remote sensing image aerial photograph 20050717 20050803 ground condition NAIP 2005 The aerial photographs provided a base layer from which channel features were delineated. An ESRI geodatabase topology rule of “must not overlap" was used for editing. This required that no bar feauture polygons encountered the same space. 2012 Bars visible in aerial photographs were outlined using a polygon feature class. The outline was drawn to represent the feature as seen at a scale of 1:2,000 in the Tillamook Bay sub-basins and upstream of river kilometer 19.0 on the Nehalem River. Downstream of river kilometer 19.0 on the Nehalem River, digitizing was completed at a scale of 1:10,000. All bar features within the study area greater than 200 square meters were digitzed. 2012 Wetted channel edges visible in aerial photographs were outlined using a polyline feature class. Line ends were snapped to existing bar polygons. 2012 Delineation of bars, channel centerlines, and wetted-channel edges was verified by project team members to ensure consistent delineation of features among years and throughout the study area and consistency with the delineation protocol of Wallick and others (2011). 2012 The bar polygon feature class was converted to points using the “Feature To Point” tool in ArcToolbox. 2012 The bar polygon and wetted channel polyline feature classes were converted to polygons using the “Features To Polygon” tool in ArcToolbox. The bar point feature class was used to label those polygons with the correct attribute information. 2012 The polygons were intersected with a polygon feature class of the study reaches to limit mapping extent and assign reach names to the polygons using the "Intersect" tool in ArcToolbox. 2012 The wetted channel feature polygons were manually labeled in the attribute table. 2012 Vector GT-polygon composed of chains 84 Transverse Mercator 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.0001 0.0001 Meter D North American 1983 GRS 1980 6378137.0 298.257222101 ofr2012_1187_Nehalem_Wetted_Channel_and_Bar_Features_2005 Nehalem River bars and wetted channel U.S. Geological Survey OBJECTID Internal feature number ESRI Sequential unique whole numbers that are automatically generated SHAPE Feature geometry ESRI Coordinates defining the features Basin River basin that contains the feature object U.S. Geological Survey Nehalem Nehalem River basin U.S. Geological Survey River Mainstem channel that contains the feature object U.S. Geological Survey Nehalem Nehalem River between river kilometer 31.4 and 0.0 U.S. Geological Survey Reach_ID Study reach that contains the feature object U.S. Geological Survey Fluvial Nehalem Nehalem River between river kilometer 31.4 and 24.6 U.S. Geological Survey Tidal Nehalem Nehalem River between river kilometer 24.6 and 0.0 U.S. Geological Survey Feature Geomorphic classification of channel features U.S. Geological Survey Bar Lateral and medial bars composed of gravel and finer sediment within the active channel and possibly mudflats and marshes in tidal reaches that were exposed and above the water surface during aerial photograph acquisition. While most of the mapped bars had little to no vegetation, some bars included small areas that were partly or wholly covered by grasses, shrubs, and (to a lesser extent) mature trees. U.S. Geological Survey Wetted channel Area of the active channel inundated by water at the time of aerial photograph collection U.S. Geological Survey NA NA (not applicable) may include ponded water or bedrock within the active channel study area measuring greater than 200 square meters U.S. Geological Survey SHAPE_Length Length of feature in meters ESRI Positive real numbers that are automatically generated SHAPE_Area Area of feature in meters squared ESRI Positive real numbers that are automatically generated U.S. Geological Survey Michael Ierardi IT Specialist mailing

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Reston VA 20192 US 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. ESRI Geodatabase Feature Class ArcGIS 10 PKZIP compression Winzip https://water.usgs.gov/GIS/dsdl/ofr2012_1187_Tillamook_Nehalem.zip None. This dataset is provided by USGS as a public service. 20201117 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 US 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time