20250826 21572300 1.0 TRUE DDisp_FederalNavigationChannel The navigable portion of a watercourse normally defined by the lines connecting the beacons and/or buoys. The channel has been subdivided into reaches. This feature class is a compilation of geographic data digitized from various sources.This dataset was updated in March 2013 with refined channel framework at Lower Desdemona Shoal, river miles 3 - 6. US Army Corps of Engineers, Portland District CENWP-OD-NWH