Yes, there is a big slide where what I think of otters squeezing under the fence and then sliding into the pond. There is a wetland area behind the dam and the overflow runs into it and then through the wetland into a creek about 400 yards away. The creek is about 5 miles upstream from the Potomac River where there are plenty of otters. So I know there are otters in the area. Just not sure what is attracting them to the pond... All it has in it right now are forage fish? Nothing bigger than about 6"...