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Description: This hydrography was generalized to 1:250,000 based on Arc SEG numbers from the original coverages. Arc SEGS with numbers less than 500 were identified as 1:250,000 Arcs. The U.S. Geological Survey (USGS) in cooperation with Federal and state agencies, and NW Indian Tribes has produced a 1:100,000-scale River Reach data layer for the Pacific Northwest that will serve water-resource management applications for the next decade or more. The Pacific Northwest (PNW) River Reach Files are a geo-referenced river reach data layer encompasses the Columbia River Basin within the conterminous United States U.S. Environmental Protection Agency's (USEPA) reach codes. This encoding process was a primary task of the PNW River Reach Project. USEPA's reach identifiers are an integral hydrologic component in regional Rivers Study known as the Northwest Environmental Data Base(NED). NED is an ongoing effort by Federal and state agencies within the region to compile reach-specific information on rivers in Oregon, Idaho, Washington, Montana. A unique conflation algorithm was developed by the USGS-WRD in Portland, that transferred the USEPA reach codes and other meaningful attributes from USEPA's 1:250,000-scale RF2 Files to the 1:100,000-scale hydrography. The new 1:100,000-scale PNW Reach Files were designed so reach-specific could be extracted from a stream network in an upstream or downstream direction using associated feature attribute tables or within a Geographic Information System. In Idaho, the Dept. of Water Resources uses these data in its basin planning efforts and the Dept. Fish & Game to map information in its Idaho River Information System (IRIS). This data is current as of 1996. Citation: USGS publication water resources investigations, Report 94-4043

Service Item Id: 98c5eaf3c0e346dc81898214a4edca86

Copyright Text: USGS

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Spatial Reference: 102605  (8826)  LatestVCSWkid(0)

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