If you know they’re using the bridge area, I’d carpet bomb the area with snares and blind sets plus probably throw a few cubbies in as well.
Is there any sort of a defined trail that they use? Get any tight spots covered in traps, if so.

Cats don’t mind tight places, but I try to keep cubbies somewhat open anyhow. Less is more in a general sense. Use whatever bait you have though I have found bird carcasses work well, if legal for you to do so.

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