The Greater Yellowstone Network monitors water quality and analyzes river discharge in the Snake River at Flagg Ranch, WY, from spring through fall each year. The headwaters of the Snake River rise over Yellowstone National Park, meander in and out of Bridger-Teton National Forest, and then return to National Park Service land on the John D. Rockefeller, Jr. Memorial Parkway. Water quality is high at this site. Our monitoring results are presented here and will be updated each year.
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Grand Teton National Park
Article 1: The Snake River at Flagg Ranch, Wyoming
The Snake River is the largest tributary of the Columbia River. The Monitoring site at Flagg Ranch, WY, is in the segment of the river designated as "wild" under the Snake Headwaters Legacy Act of 2009, an amendment of the 1968 Wild and Scenic Rivers Act. Read more
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Grand Teton National Park
Article 2: Water Flow in the Snake River at Flagg Ranch, Wyoming
Daily flow measurements on the Snake River at Flagg Ranch, WY, are recorded from a U.S. Geological Survey streamflow gage. Most recent discharge results are presented here. Read more
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Grand Teton National Park
Article 3: Snake River Water Quality at Flagg Ranch, Wyoming
Each year, we collect water from across the entire width of the river and at multiple depths to test for chemical and metal components. We also measure water temperature, dissolved oxygen, conductance, pH, and turbidity. Read more
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Grand Teton National Park
Article 4: Monitoring Methods for the Snake River at Flagg Ranch, Wyoming
The Greater Yellowstone Inventory and Monitoring Network monitors water resources in parks, including the Snake River at Flagg Ranch, WY, in John D. Rockefeller, Jr. Memorial Parkway. This long-term monitoring is based on peer-reviewed protocols. Read about our monitoring methods here and explore the protocols by clicking on the links at the bottom of the page. Read more
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Grand Teton National Park
Article 5: Water Quality Criteria for the Snake River at Flagg Ranch, Wyoming
Links to federal and state water quality standards that apply to the Snake River are found here. Read more