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Oregon Water Science Center



Pacific Northwest


Primary Sources of Total Nitrogen (2002)

Primary Sources of Total Nitrogen Load Generated Within Incremental Watersheds of the PNW

map of Columbia River Basin

HUC level 3 boundaries

Location Map

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Primary Sources of Total Nitrogen Load Lower Snake River Snake River Headwaters Upper Snake River Middle Snake-Boise Rivers Oregon Closed Basins Southern Oregon Coastal Rivers North Oregon Coastal Rivers Lower Columbia River Deschutes River John Day River Yakima River Middle Columbia River Salmon River Kootenai River Clearwater River Spokane River Pend Oreille River Middle Snake-Powder Rivers Willamette River Upper Columbia River Washington Coastal Rivers Puget Sound
Click on a 6-digit, 3rd-level hydrologic unit code (HUC6) watershed for share of total load contributed by different sources

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Page Last Modified: Friday - Jan 4, 2013 at 19:30:22 EST