This
  hydrography was generalized to 1:250,000 based on Arc SEG numbers from the
  original coverages.<span style=''>  </span>Arc SEGS with
  numbers less than 500 were identified as<span style=''> 
  </span>1:250,000 Arcs.<span style=''>  </span>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.<span style=''>  </span>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 &amp; Game to map information in its
  Idaho River Information System (IRIS).<span style=''> 
  </span>This data is current as of 1996.<span style=''> 
  </span>Citation:<span style=''>  </span>USGS publication
  water resources investigations, Report 94-4043
<DIV STYLE="text-align:Left;font-size:12pt"><P><SPAN><SPAN>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 &amp; 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</SPAN></SPAN></P></DIV>
[]
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