I'd use Koro/Hancock traps with a peeled stick with castor on it for bait on the bank near the cut trees and in the bottom edge trails use double door swim through cages that BearTrap, Humptulips, and others make or Comstock traps. You can also use big cage traps (14 x 14 x 42 or larger) baited with castor on the banks but most cage traps on the market are too weak to hold a good-sized beaver for 24 hours and need serious reinforcing.