If the backwaters of the Mississippi flood in the spring(lol if?), a lot of the flooded areas are great for dogfish!
I fished a flooded park one year, casting bucktails for northern in the grass while literally standing in a playground, it was awesome. Caught like 4 dogfish and 1 northern, and those dogfish fight and are a mess to unhook sometimes.
Same place I fished at night closer to the actual channel where there was some slight current. It was pretty dark and surreal, fishing in a flooded parking lot, but it was a blast! Caught sheephead, walleye, bass, northern, carp and doggies.
Creepiest thing though, standing there in waders at about 2 in the morning, take a step backwards and felt something brush my leg. Turn around and there were 3 dogfish just sitting there, using my legs as a current break. Or were they plotting how to take me down? You decide.