Algae blooms and fish kills on the Snake River are likely getting a boost from its tributary the Boise River, according to a recent study by the U.S. Geological Survey.
Phosphorous problems in Idaho’s Boise River have been known for years, but the stream’s contribution to the Snake River’s nutrient troubles has been less clear. USGS monitoring found that the Boise River contributes 11 percent of the Snake River’s flow below the confluence of the two rivers while contributing 30 percent of the Snake’s total phosphorous.
The USGS recommends that managers base future algae growth monitoring on dissolved oxygen instead of chlorophyll a because continuous oxygen measurements capture short-term variations.
Read more at USGS Newsroom
Image credit: USGS