Sylvan Lake, Mountain lake in Custer State Park, South Dakota.
Sylvan Lake is a 17-acre body of water in Custer State Park bordered by granite cliffs and pine forests at approximately 6,145 feet elevation. The lake has multiple access points where trails branch out toward different destinations in the park.
Theodore Reder built a dam across Sunday Gulch Creek in 1891, creating this mountain lake. That early engineering project transformed a mountain stream into a lasting outdoor recreation site for the region.
The lake serves as a recreation hub where visitors swim, climb rocks, and explore the surrounding trails on foot. The granite cliffs shape how people experience and use this water-centered gathering place.
Swimming is allowed and small boats can be rented, but motorized watercraft are prohibited to preserve the natural setting. Several hiking trails start near the shoreline and lead to nearby destinations including Black Elk Peak and rock formations called The Needles.
The lake reaches about 30 feet deep at its deepest point and stays free from motorized boats, preserving a quiet mountain landscape. This absence of engine noise allows visitors to experience the surroundings in an unusual way.
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