I found a spring fed slew years back when every thing else was frozen. The coons came out of a brush pile and went right into the water and followed it making trapping easy. I managed to catch enough there to help pay for Christmas. They dont get out much in the dead of winter but they do not hibernate. Hunger drives them out.
On a water set you can use skinned legs from muskrats or any other small animal (road kill cats or squirrels even)with a sharpened stick to pin it to the creek bank over the trap. Any blood or smell will attract them to the trap.Make a flattened spot with your boot and set the trap just under the surface next to the bank.