Washington modernized surface water mapping period of performance: 09 15 2025 - 08 31 2028ABSTRACT summary: this project supports the purchase of elevation derived hydrography (EDH) datasets that meet…

The U.S. Geological Survey (USGS) Office of Acquisitions and Grants awarded the State of Washington Department of Ecology a $1,479,640 Cooperative Agreement under the National Geospatial Program: Building The National Map (CFDA 15.817) for the period of September 15, 2025 through August 31, 2028. The project, Washington Modernized Surface Water Mapping, supports the acquisition and development of Elevation Derived Hydrography (EDH) datasets that meet USGS specifications for incorporation into the 3D Hydrography Program (3DHP). The second-year effort focuses on six watersheds (HUC8) in eastern Washington totaling 9,894 square miles, selected for the availability of verified Light Detection and Ranging (LiDAR) data from the 3D Elevation Program (3DEP) in a contiguous region.

The project includes submission of EDH data for the Walla Walla Watershed, which was piloted during the first year to test methodologies for arid environments in eastern Washington; this submission carries no additional cost. Deliverables will serve federal, state, local government, tribal, and consultant stakeholders through geospatial products designed to enhance national hydrographic data coverage and support decision-making across multiple levels of government.

Intended beneficiaries

Washington hydrography stakeholders represent federal, state, local governments, tribal and consultants.