Longmont Dam Road Access serves as the primary trailhead for Button Rock Preserve, offering a wide dirt road that provides easy access along North Saint Vrain Creek to fishing locations and Button Rock Dam.

The parking area accommodates 60 vehicles and is open daily from one hour before sunset to one hour after sunset, with a fully accessible creekside fishing pier located just past the entrance gate.

Dogs are prohibited, camping and overnight parking are not allowed, and the preserve is walk-in only beyond the vehicle gate.