If nothing changes, Lewis and Clark Lake will be half full of sediment by the year 2045. More than 75,000 acre feet of sediment enter the six Missouri River main stem projects annually. Gavins Point Dam traps 2,700 acre feet annually in the system’s smallest reservoir. Sedimentation problems in the Missouri River reservoirs may not be visible to the naked eye in all locations, but they are occurring in all the reservoirs, including near tributary confluences. As sediment continues to accumulate it can, and will, result in the loss of hydropower production, negatively affect recreation, including fishing and boating, cause a reduction in flood control capability, and negatively impact public drinking water and agricultural water intakes, plus have many other negative impacts.
Learn more about ideas for Lewis and Clark Lake discussed at a Solutions Workshop in June 2021 at Yankton, South Dakota.