Directions From:Koshkonong Mounds C.C. is located 1 mile south of Fort Atkinson, WI on beautiful Lake Koshkonong. less than 1/2 mile off State Hwy 26. Interactive Map: JavaScript must be enabled in order for you to use Google Maps. However, it seems JavaScript is either disabled or not supported by your browser. To view Google Maps, enable JavaScript by changing your browser options, and then try again.