Ice Harbor Pool Geographic Response Plan (SIH-GRP)

Snake River Image

The existing Snake River Ice Harbor Pool (SIH-GRP) covers a 41-mile reach of the Snake River from the confluence of the Snake and Columbia Rivers to the Lower Monumental Dam. The 2015 update to the Middle Columbia River McNary Pool GRP incorporated some of this territory, specifically the lower reach of the Snake River from its confluence with the Columbia River to the Ice Harbor Lock and Dam at river mile 9.6. The 2016 update to the SIH-GRP will start at the Ice Harbor Dam and continue 32 miles upriver to the Lower Monumental Dam at river mile 41.6. This section of the river, known as Lake Sacajawea, is located within the Lower Snake Water Resource Inventory Area. It runs through Franklin and Walla Walla Counties, and has agricultural lands but no municipalities located along the shore. Several oil pollution threats are present within the SIH-GRP area, including: the dams, tank vessels and barges, 31 miles of Union Pacific rail line, oil storage tanks from agricultural/manufacturing sources, and roadways.

View the Snake River Ice Harbor Pool GRP (June 2017) (PDF 11 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.


How to Comment

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

U.S. 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. ox 47600
Olympia, WA 98504-7600