I know that the Detroit River is an great spot to fish for Walleyes, but what about lake Erie? I went trolling with a crawler harness in about 27' of water and we caught a lot of fish, but a lot of them were under 15'' so we had to let them go. The biggest was about 5lbs and one guy lost about an 8lb fish. This was also mid summer on a hot day, so maybe if you fished earlier in the season I am sure you could pull out a decent limit.
Also the Maumee River is an outstanding place to Walleye fish when they are spawing in spring. If anyone goes down there everybody uses floating jig heads with a 3'' curly tail grub. Use the same style as you would fishing a spawn bag for steelhead, cast upstream and let the sinker "tick" bottom all the way down.