If you want alot of Beavers, go to N.E Penn. like wayne county and catch them now because the Pa. Game Commission wants them gone. When I started trapping beaver back in middle 80's, there were beaver everywhere in Tioga, Potter, Clinton, Lycoming, Bradford counties.
Every trout stream had dams every mile or so and they were trapped hard and the limit was 3. It quickly went to 5, then 10 and now you can catch 40 in each county if you can find them. They are becoming non-existent and they are very hard to find. PGC used to post dams and give them a chance to recoup but not the case anymore.
Before long we will have more otter than beaver. Thats just my opinion but I could be wrong.