Highline Lake State Park offers two boat ramps for water access: the West Boat Ramp on the west side of the park and an East Boat Ramp, with the West Entrance featuring an Aquatic Nuisance Species inspection station.

The park provides a free Life Jacket Loaner Program at the Visitor Center and West Entrance, and note that Highline Lake is designated as infested with zebra mussels, while Mack Mesa Lake is open to kayaking, paddleboarding, and fishing with hand-powered or electric motors only.