Place a #2 coil spring leghold trap on the 4 corners of the bridge using a blind set with Bobcat urine as scent and deer meat (or what ever you have) buried in the back corner of the trap. Attach the trap to a 6-8 ft drag with a lot of limbs to snag on brush. Never stake a trap down for Bobcats. Drags work best. It's been a while, but I caught 18 using this set in 1980-81.

Mickey