My family has half of a small (35 acre) lake and we are having a probleem with beaver building up the earth and rock dam. They are getting it too close to the top of the earthworks, to the point that if another big storm goes thru like a week ago and the level of the lake rises like it did, the damn will put it higher than the access road that crosses over the outlet stream and the lower side of the earthworks.

I was thinking of getting some traps and such and next time I've got a week off, going up and setting traps to lessen the problem.
The main dificulty is that we don't own the half where the lodge and most of the traffic is at and the person who does is strictly "no trespass, no hunting or trapping allowed at all", so the only place I can trap is right at the dam.

What would be the best stratagy, trap rigs, and how to set them up?
Is a just a few days, a week at most, enough time?
Any help is appreciated.