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_Centerline_1939 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 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. 1939 ground condition Complete None planned -123.945645 -123.752125 45.732806 45.655919 ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Thesaurus sediment transport fluvial geomorphology historical channel change channel stability USGS Metadata Identifier USGS:67479905-c05b-4ccc-bc75-49a50eda0620 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

Oregon Water Science Center

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Portland OR 97201 US 503-251-3474 mkeith@usgs.gov https://water.usgs.gov/GIS/browse/ofr2012_1187_Nehalem_Centerline_1939.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 channel centerline mapping was reviewed by a minimum of three team members to ensure protocol was followed and that mapping was consistent between time periods. The channel centerline was reviewed and manually edited by team members to ensure that linework did not intersect bar features. Data are complete. Channel centerline 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. Centerlines were digitized along the center of the wetted channel. 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. U.S. Army Corps of Engineers unknown remote sensing image 10200 aerial photograph 19390508 19390512 ground condition USACE 1939 The aerial photographs provided a base layer from which channel features were delineated. 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. 2012 Channel centerlines were digitized along the center of the wetted channel through the study area using a polyline feature class. 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 polylines were intersected with a polygon feature class of the study reaches to limit mapping extent and assign reach names using the "Intersect" tool in ArcToolbox. 2012 Vector String 2 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_Centerline_1939 Nehalem River channel centerline 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 SHAPE_Length Length of feature in meters 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