20240903 11144300 1.0 TRUE Columbia Basin Boundary Columbia Basin Boundary. This dataset is based on a dissolve of the Watershed Boundary Dataset (USGS). It was created by dissolving the "WBD_HU4" (subbasins) within the "WBD_17_GDB.zip" geodatabased downloaded from USGS (ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Hydrography/WBD/HU2/GDB/) on 12/11/17. USGS, PSMFC GIS