I may move one of the boxes to the middle of the little pond to give the ducklings at least a few minutes of protection.
Any other ideas?
Put 'em on land. A quote from the
Wood Duck Society:
Nest boxes can be installed on land or in water. On land, a shoreline installation is fine, but not necessary. Wood ducks have been known to use tree cavities and nest boxes up to a mile away from water. Land-based boxes can be monitored on a walk-up basis, do not require boats or waders, and eliminate worries about varying water levels and bending of poles from ice-out conditions in the north. In teaching situations, it is safer and easier to bring students nose-to-nose with a clutch of eggs using land-based boxes.