Harrison Lake Boat Ramp is a concrete double-lane ramp on Willow Creek Reservoir near Harrison, Montana, featuring improved access with a widened (28 feet) and extended design to accommodate two vehicles simultaneously and allow launching during seasonal water drawdowns.

The 40-acre fishing access site offers 12 primitive campsites, toilets, and a 7-day stay limit, with a maximum trailer length of 20 feet and a $12-18 camping fee depending on fishing license status.