It is, I think it might be about 40 miles north. I got onto the the levee roads the west of town and did some looking about by the river, its a mosaic of public and private but I did find some spots you could hunt. The river was very low, so anywhere there was an extended stretch of water held ducks. I didn't focus on ducks since I was after crane but on a crane stakeout I had a number of mexican ducks fly by me. I think its an area worth scouting around, it may never produce big numbers but I had it to myself for the most part. Farmers, if you could find them, were pretty cool with allowing access for crane, don't know if it might be the same for duck.
Conserve, promote, protect and enhance...then harvest!