Rob, until you "relocate" ALL the Muskrats you will continue to have the same problem. A #110 Conibear trap works well as does a .22 Mag.
If they would just burrow into the banks it would
not be that much of a problem but the maze of tunnels and den room in the dam I can't have.
However, to be P.C., you should check the local trapping/hunting laws. It is illegal to shoot Muskrats here in Michigan. But, it is your property and you have to deal with the problem in your own way.
Dan

Mistakes are proof that you are trying.


Dan