Measuring Mississippi mussels
The U.S. Army Corps of Engineers is conducting a mussel survey in the pool at Lock & Dam No. 3 this week and next week.
The survey is in preparation for a pool-wide drawdown, which will take place in the coming years, corps biologist Dan Kelner said. During the drawdown, the pool water level is reduced, allowing some native plants to regrow. However, the reduced water level can put native mussel populations at risk, Kelner said.