 Public access swim beaches at Beaver Lake are managed by the U.S. Army Corps of Engineers. Most recently, they shut down the dam site beaches on June 25th due to unacceptable levels of E. coli bacteria in the water, but reopened them in time for the 4th of July. Corps spokesperson Jay Townsend says they test the water on behalf of the Arkansas Department of Health. And if we get higher than acceptable levels of E. coli, then they tell us we need to close these swim beaches down.