Green River/Duwamish Geographic Response Plan Update
The Washington Department of Ecology is updating the Green River/Duwamish (GRD) Geographic Response Plan (GRP). With this update, the Upper Green River GRP was added to the Green River/Duwamish GRP. An important part of the update process is hearing from the people who live, work, and play in the GRP area. To facilitate this, a public comment period will be open from February 14, 2025 at 8am to March 19, 2025 at 11:59 PM..
Description of the Planning Area
The Green River/Duwamish (including the Upper Green River) planning area starts in the headwaters of the Green River in the Cascade Mountains near Stampede Pass. The Howard A. Hanson Dam blocks the river’s flow and creates a reservoir 64 river miles upstream of where the river enters Puget Sound in Seattle at Elliott Bay. Below the Dam, the river flows through the steep rock cliffs of the Green River Gorge. Rural areas and suburban developments are present in the Green River Valley at the middle reach of the watershed. As the river continues toward Puget Sound, urban areas line the river. The Green River becomes the Duwamish River at the former confluence with the Black River at Tukwila (near river mile 11). The planning area ends on the Duwamish River at river mile 6.5 near Cecil Moses Memorial Park on the left bank and North Wind’s Weir on the right bank. The remainder of the Duwamish River/Waterway, from the weir to the mouth at Elliott Bay in Seattle, is included in the Central Puget Sound GRP. The planning area is within the Duwamish-Green Watershed or Water Resource Inventory Area (WRIA) 9.
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The Washington Department of Ecology is updating the Green River/Duwamish (GRD) Geographic Response Plan (GRP). With this update, the Upper Green River GRP was added to the Green River/Duwamish GRP. An important part of the update process is hearing from the people who live, work, and play in the GRP area. To facilitate this, a public comment period will be open from February 14, 2025 at 8am to March 19, 2025 at 11:59 PM..
Description of the Planning Area
The Green River/Duwamish (including the Upper Green River) planning area starts in the headwaters of the Green River in the Cascade Mountains near Stampede Pass. The Howard A. Hanson Dam blocks the river’s flow and creates a reservoir 64 river miles upstream of where the river enters Puget Sound in Seattle at Elliott Bay. Below the Dam, the river flows through the steep rock cliffs of the Green River Gorge. Rural areas and suburban developments are present in the Green River Valley at the middle reach of the watershed. As the river continues toward Puget Sound, urban areas line the river. The Green River becomes the Duwamish River at the former confluence with the Black River at Tukwila (near river mile 11). The planning area ends on the Duwamish River at river mile 6.5 near Cecil Moses Memorial Park on the left bank and North Wind’s Weir on the right bank. The remainder of the Duwamish River/Waterway, from the weir to the mouth at Elliott Bay in Seattle, is included in the Central Puget Sound GRP. The planning area is within the Duwamish-Green Watershed or Water Resource Inventory Area (WRIA) 9.
Contact Information
*Indicates Required Fields