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)
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