Royce-Dallman County Park is a small 3-4 acre access point on Lake Koshkonong designed primarily for launching small boats, featuring a curved boat ramp, ample trailer parking, picnic pavilion, restrooms, drinking water, and a life preserver lending station for children.

A Rock County launch pass is required from April 15–October 31, with fees payable on-site via envelope drop. The park offers convenient access to Wisconsin's eighth-largest inland lake with an average depth of 6-7 feet, ideal for small watercraft and fishing.