We have made a trip up to pool 4 in early September for the past several years and have found some good numbers of pike on lower pool 4 just below Lake Pepin. There is a slough that runs from Reads Landing to just above Wabasha.
The slough begans below a series of wingdams so you have to be carefull getting in there. Thre are lots of short closing dams and rock structures in this slough which is actually a series of sloughs. We have always caught some pretty nice northerns in the deeper pools below these structures in that slough mainly casting crankbaits. Some of the pike we have caught and almost caught have been brutes. We’ve also caught bass and walleye back in there but they are usually on the small side.
Last year we made our daily trip down to pool 5A at Fountain City and a buddy was casting a buzz bait for northerns and smallies and hooked into a really nice musky that was just a half inch short of being legal. If there are muskies in pool 5A I’d imagine there are also a few in pool 4 as well. The place where he caught the musky is very much like the slough up in pool 4 that I mentioned above.