Ok, I've only fished it twice, many years ago. But the first time me and my hunting buddy were building our duck blind around Dresser Island (before the pullovers, so that should tell you how long ago it was). It was late Sept/ early Oct. and we saw a couple of boats tearing the crappie up in the main slough before you got into the island. The next weekend we finished up our blind and decided to try our luck dipping jigs along the blow downs on the main channel and caught enough for a good fry for our families. Nothing big, but a couple dozen 9-11" fish. The next spring we went out there in early march, and didn't do too well with jigs, but started dipping minnows and caught a few until we went in the first cove off the river on the south end of the island, you can't miss it, there is a duck blind in the middle of the cove, one outside the cove off of the point, and at that time there were two blinds in the far back of the cove, and that's where we caught a bunch. It was cold, overcast, calm, and the fish were in about a foot to 2 foot of water.
Again nothing big, but quite a few 9-10 inchers. Didn't throw back very many dinks, and minnows seemed to be the only thing they'd hit.
We went back there late april, but I don't think we caught enough to clean.