Blind sets. I use #110s and find any little finger or trickle of a creek that is no wider than this trap, and I look for pinched down areas and grassy overhangs, little trails up and over points, abandoned muskrat holes, root overhangs, etc.
After ice up, or a fresh snow, I look for tracks. Beaver dams with ice on both sides are great spots for winter blind sets...I look for little muddy tracks on the ice to locate the entrance/exits most used to get underwater.
I pick up a lot of mink while blind setting for rats with this same trap size in rat runs, too.
Jim-NE