20210303 08583700 1.0 TRUE River Depth Contours Willamette and Columbia River depth contours for the City of Portland area. River depths are from ordinary high water (OHW), as measured by the U.S. Army Corps of Engineers in 2004. --Additional Information: Category: Hyrdo Purpose: For representing depth from ordinary high water in the Willamette and Columbia rivers. Update Frequency: None planned -- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=53397 Corporate GIS