South Twin Lake's state-sponsored boat ramp is located in Partridge Cove off Maine State Route 11 and features a hard-surfaced ramp (20 feet wide, 100 feet long) with a 13% grade suitable for trailered boats.

The ramp provides access to a 3,200-acre freshwater lake approximately 6 miles west of Millinocket, with 10 parking spaces available and floats for boarding.

Boaters should be aware of navigation hazards including rocks and drifting logs, particularly in spring.