This is not the greatest picture, but it is an awesome muskrat location. Small little stream exiting the dead beaver pond in the above pictures. Leads to another active beaver pond about a quarter mile away. Had a 160 set where shown, a funnel trap set farther down where it was deep enough to submerge it, and another 220 set down below that. On the check, the 160 had that rat, the funnel had two nice rats, and the 220 had a little dinky one. Good spot.
Those sorts of places are some of the best muskrat sets I have ever found. A big plus is that they stay open for extended periods. I had a similar type location except a much bigger creek (about 3 feet wide) that I caught 13 muskrats out of one set last season. Started it out with a 220 as an "otter set", but after the fifth rat just switched it to a funnel trap. This was over the course of around 6 weeks, and as that was the only set, I wouldn't of done it just to rat trap; but I had sets for other species in the area and an easy rat or two a check actually just about covered the gas.
Everything else was froze, but that set was in sort of a springy area between two ponds that didn't freeze till January.