Fort Stevenson State Park features two wide, multilane concrete boat ramps—one at Garrison Bay and one at de Trobriand Bay—providing excellent access to Lake Sakakawea for both motorized and paddle craft.

Each ramp includes a courtesy dock, designated parking, vault toilets, fish cleaning stations, and nearby marina facilities with gas pumps.

The park also offers equipment rentals including motorized boats, pontoons, kayaks, canoes, and stand-up paddleboards for visitors without their own watercraft.