There are plenty of places to fish along Darby Creek. There's a swimming hole just up the trail about a hundred yards from the trailhead that's good for fishing too. I've been using it since I was a child. You can also try way upstream (1 mile or so) near the bus yard where there's a deeper hole. Good luck!
I've definitely seen people fishing in this park. Not sure if they can catch anything.
Not sure of the best places to go fishing off the creek. There are several place along the creek walk that I'm sure would be suitable to fish without your line getting caught in the tree branches.
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