Highline Lake State Park offers two boat ramps for water access: the West Boat Ramp (accessible via the West Entrance) and an East Boat Ramp. The park features a Life Jacket Loaner Program available free at the Visitor Center and West Entrance.

Note that Highline Lake is open to boating March 1–September 30 (weather permitting), with Wednesdays designated as wakeless days, while Mack Mesa Lake is restricted to hand-powered or electric-motor vessels only; all motorboats and sailboats require Aquatic Nuisance Species inspections before launching.