Stillaguamish River Geographic Response Plan (STLGR-GRP)

The Stillaguamish River GRP planning area is approximately 89 square miles, and resides within the boundaries of Snohomish County. Fully or partially, it includes the towns or cities of Arlington, Bryant, Lakewood, and Silvana. It entirely resides within the boundaries of the 10th, 38th, and 39th Legislative Districts. Portions of WRIA 3 (Lower Skagit/Samish), WRIA 5 (Stillaguamish), and WRIA 7 (Snohomish) fall within this planning area, and includes: Armstrong Creek (3.1 Miles), Church Creek (0.3 Miles), Cook Slough (1.7 Miles), Harvey Creek (0.6 Miles), Jackson Gulch (1.8 Miles), March Creek (2.4 Miles), Middle Fork Quilceda Creek (3.6 Miles), North Fork Stillaguamish River (2.1 Miles), Pilchuck Creek (9.2 Miles), Portage Creek (10 Miles), Quilceda Creek (1 Miles), South Fork Stillaguamish River (2 Miles), South Slough (1.8 Miles), Stillaguamish River (13.3 Miles), and the West Fork of Quilceda Creek (2.2 Miles). The Stillaguamish Tribe has reservation lands in the area, and the Lummi, Muckleshoot, Nooksack, Samish, Sauk-Suiattle, Snoqualmie, Stillaguamish, Suquamish, Swinomish, Tulalip, and the Upper Skagit Tribes all have potential interests in the area. Major roadways include: Interstate 5 (16.7 Miles), Hwy 9 (20.2 Miles), Hwy 530 (18.9 Miles), Hwy 531 (12 Miles), and Hwy 532 (3.2 Miles). BNSF (20.6 Miles) is the only company that owns railroad track in this area. The BP Olympic Pipeline (23.5 Miles) resides within the boundaries of this planning area. The Stillaguamish River GRP is bordered by the North Central Puget Sound GRP to the south and west, and the Lower Skagit River GRP to the north.

View the Stillaguamish River GRP (June 2017) (PDF 10 MB)

Interim Updates

In between plan updates, GRP strategies are tested during drills and actual spill events. The results of these tests may require changes to certain response strategies, notification strategies, staging areas, or boat launch locations. Eventually, these changes will be fully incorporated into the plan. Until that time, please use the updated strategy and information sheets below in lieu of that provided for similarly numbered locations in the published plan.

There are no interim updates at this time

How to Comment

If you have any questions or comments, suggestions for improvement, or find errors in this document please submit comments online at, email them to us at, or forward them via U.S. Mail to the following agencies:

United States Environmental Protection Agency
Region 10
Office of Environmental Cleanup
1200 Sixth Avenue
Room ECL-116
Seattle, WA 98101

Washington State Department of Ecology
Spill Prevention, Preparedness, and Response (GRPs)
P.O. Box 47600
Olympia, WA 98504-7600