Lost Valley Campground has 216 seasonal campsites, and 15 weekend sites reserved for friends and family of those seasonal campers. Open May 1st, October 31. Lost Valley has a large pavillion with a fireplace, a swimming beach, playground, small marina with row boat and kayaks for rent, horseshoes, volleyball court, basketball court and laundry room. Propane and wood are available. There is a campground store with hand dipped ice cream and other convenience items. Lost Valley is wooded with white birch, aspen, oak, maple and pine. Located on 55 acres with an 80 acre natural lake. 1700 feet of lake frontage on East Twin Lake.