That was how I caught my first beaver. I used a large cage with the caster mound in the back of the cage. BUT like I said, it rubbed it fur off in a couple places on the hide. So I am now I am not a fan of catching them on the land. Pinch points in the water seem to be the ticket. But you don't always have that. I have some of Bruce's traps, but I don't want beavers or otters to rub them self's before I can get to them. I would rather figure out a drownder set.
Right now I have a spot with wide, deep water. With tons of slides and pull outs, but no pinch points in the water. Trying to figure out how to trap that with cages. I tried trap at a angle in the water at the end of the slide with brush on top like dive sticks. Maybe if I ring it with brush/sticks with a clear patch of water, it will work when they are going down the slide. But no way it's going to work when they are coming out of the water..... just hmmm... I will keep trying, just wondering if anyone had a trick, or good way to set it. Thanks for the help and ideas. I like your idea of making a ditch with water to the pull out, to make your own pinch point. I am going to have to try that. Thanks