All of the creeks mouths that dump into the river in that area hold crappies almost year round. The best places I've found around the Paulouse are out in front of the bluff that's on your left side (west) as you head up river from the park. In early spring (April to mid May out there) you will find huge schools near the bluff and right up against it. Sometimes the fish can be 4 to 6 feet down suspended over 15 - 30 feet of water. Just cruise around that area and watch your depthfinder. They can be "out in the middle over nowhere" there...meaning they can be 100 yards off that bluff. You have to crusie to find them but when you do find them they bite great. As the water warms they will head in closer to the bluff and the cover just north of it. They will spawn all along that west bank in water that's 2-5' deep.
Across the river at the marina is great area as well. From late May though Fall you can catch true slabs around those docks. Night time is best for the slabs. They will average 10-12 inches but there will be a few going 14-16" and weighting about 1.5. lbs. Check out a map and look for areas where those little creeks dump in...they are killer for slabs and you'll have them all to yourself. I've found some really nice holes below and above the dam.
All white jigs and anything with chartreuse in it seems to work great. When I fish the bluffs I set a float 4-6 feet above a jig and slow troll it right against the bluff face. We nail walleye, cats, and slabs that way. In the coves we tightline jigs along rocks or docks until we find the depth they are using. Don't be afraid to use spinnerbaits, crankbaits, grubs, etc for the these guys. There are a lot of smaller fish to weed through and sometimes the larger lures are the ticket to get to the slabs out there.