Sylvan Lake is located 7 miles up on Sylvan Lake road Custer, and is within the Custer State Park boundary. In 1881, a dam was built across Sunday Gulch to create the body of water. The scenery is absolutely amazing with evergreens and granite formations surrounding the shoreline. You'll also be entertained to have a chance to see bison, pronghorn, big horn sheep, mountain goats, deer, eagles, and other wildlife. A $15 park entrance fee is required for each vehicle, and a campground is located down the road.