While the landowners hate them, beaver ponds are often very good fishing. In the summer when stream flow diminish or completely dry up , beaver ponds often offer the only deep cold Water for fish to reside in.BBC2 today had 45 minutes about beavers in the Tetons Nat Park and their management problems. Blocked road culverts and waterlogged areas due to flooding across land with gentle gradients and the beavers put in a 3 or 4 foot high barrage across. Sequences of ponds have no effect on reducing flooding in winter as you simply have a series of filled up baths leading one to another. Having a spate is just turning up the tap into bath one and the flow goes down the system uninterupted.