Just wodering if you ever found a "magic" solution? Since, I now have a similar problem /w3tcompact/icons/frown.gif.
I first saw signs of beavers, what was left of the small trees anyway, this spring. It took awhile but found that they had dammed a small feeder creek, to the main creek. The small feeder creek is on my neighbors property, and was not causing any problems.
During the low creek flow, this summer, the beavers took to damming the main creek. Not a problem at first, since it was still contained to the creek bed. Well, now they are causing the water to go over the banks, and a portion of my tractor access trails are submerged. /w3tcompact/icons/frown.gif Even this wouldn't be too bad, if the new beaver pond had any chance of surviving the spring runoff. The dam will either washout, or be filled in with allot of gravel, and the creek will find a new route.
My son and I spent a couple hours dismantling part of the dam (built much better than you would think). It lowered the level a foot or two, but within 2 days that had it repaired and water level back. They are very industrious!
I can get a nuccence permit that allows for trapping or shooting them for a year. If this was neccesary, I hope to find someone that would do it for the exchange of the pelts. I really don't want to get into live trapping, ie handling beavers and transporting them (rabies), etc.
Current plan, is to do nothing and wait to see how it makes it through spring, but figure there will be a mess, and will require a dozer to make new access trails.