Rock Island State Park's boat ramp is located at Jackson Harbor on Washington Island and provides free parking and access to Lake Michigan for launching boats to Rock Island.

Boaters should exercise caution due to hazardous conditions including reefs and storms, and overnight mooring at Rock Island costs $1 per foot of boat length with limited dock space available on a first-come basis.

Canoes and kayaks are also welcome and can be transported via the passenger ferry for a nominal fee, with the option to beach them near campsites.