Directions
From Rapid City take Sheridan Lake Road 18 Miles South West. Turn left at the Y intersection. There is a sign pointing to the North Shore Recreation Area. You may be required to stop at the toll booth, but you will not be charged the $5.00 daily recreation fee since you are a customer to the Sheridan Lake Marina. Proceed through the toll booth, stay to the right all the way until the road dead ends in front of the store.
Check out the map and extra directions at MapQuest.