Does anyone know a way to find out if / when UE is pulling the lake?

We have my nephew's condo dock set up beautifully - 20 something 5ft X 5ft PVC trees hanging from the dock - over 20 to 60 ft of water.

The dock is on the inside of a major channel turn. When they're pulling the lake the crappie disappear completely. When they are not, we do very, very well. The current is surprisingly strong when they pull.

Any insight on how we might forecast weekend pull rates would be appreciated.