Scientific Investigations Report 2007–5186
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5186
Figure 26. Summary of annual nutrient load to delineated catchments for total nitrogen and total phosphorus in the Columbia River and Puget Sound Basins, water year 2000 and calendar year 2002. Trend sites are designated with red circles, whereas all circled sites were used for load estimates.