The Greater Yellowstone Network monitors water quality and analyzes river discharge in the Lamar River between April and November each year. Water quality is high in the Lamar River; about three quarters of its watershed is contained within Yellowstone National Park. Discharge records for the Lamar River go back to 1923. Our monitoring results are presented here and will be updated each year as new information is collected.
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Yellowstone National Park
Article 1: The Lamar River Site
The Lamar River is the largest tributary to the Yellowstone River in Yellowstone National Park. About three quarters of the Lamar's watershed is contained within the park. We monitor water flow and quality near Tower Ranger Station, WY. Read more
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Yellowstone National Park
Article 2: Water Flow in the Lamar River near Tower Ranger Station, Wyoming
Daily flow measurements on the Lamar River are recorded from a U.S. Geological Survey streamflow gage near Tower Ranger Station, WY. Most recent results of discharge on the river are presented here. Read more
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Yellowstone National Park
Article 3: Water Quality in the Lamar River near Tower Ranger Station, 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 collect core water quality measurements, including water temperature, dissolved oxygen, conductance, pH, and turbidity. Read more
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Yellowstone National Park
Article 4: Monitoring Methods for the Lamar River near Tower Ranger Station, Wyoming
The Greater Yellowstone Inventory and Monitoring Network monitors water resources in parks, including the Lamar River in Yellowstone National Park. 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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Yellowstone National Park
Article 5: Water Quality Criteria for the Lamar River near Tower Ranger Station, Wyoming
Links to federal and state water quality standards that apply to the Lamar River are found here. Read more