Fish and water temperature
Some reservoirs stratify (warm water stays on top, while cold water sinks to the bottom). Water from these reservoirs can sometimes be used to help manage temperature conditions for aquatic species downstream. Depending on the time of year, warmer or cooler water can be released to help manage downstream temperatures.
Read more about how reservoirs help manage river temperatures.
The video below, with animation, has information about fish cooling systems at two lower Snake River dams.
This video shares one of the many ways the U.S. Army Corps of Engineers is pioneering some of the most advanced fish recovery technology regarding environmental stewardship including improving technology like the water cooling systems at Little Goose and Lower Granite locks and dams.