| Sylvan Lake | |
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Rock formations near lake
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  Sylvan Lake Show map of South Dakota  Sylvan Lake Show map of the United States | |
| Location | Custer County, South Dakota, United States |
| Coordinates | 43°50′44.52″N 103°33′48.57″W / 43.8457000°N 103.5634917°W / 43.8457000; -103.5634917 |
| Primary outflows | Sunday Gulch Creek |
| Basin countries | United States |
| Surface area | 17.3 acres (7.0 ha) |
| Average depth | 12.8 feet (3.9 m) |
| Max. depth | 30 feet (9.1 m) |
| Shore length1 | 1 mile (1.6 km) |
| Surface elevation | 6,145 feet (1,873 m) |
| 1 Shore length is not a well-defined measure. | |
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| Southwestern South Dakota |
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Sylvan Lake is a lake located in Custer State Park, in the Black HillsofSouth Dakota, United States. It was created in 1891 when Theodore Reder built a dam (the Sylvan Lake Water Dam) across Sunday Gulch Creek.[1] The lake area offers picnic places, rock climbing, small rental boats, swimming, and hiking trails. It is also popular as a starting point for excursions to Black Elk Peak and The Needles. A hotel was operated on the shore of the lake in the early 20th century .[2]
The lake was featured in Disney's 2007 film National Treasure: Book of Secrets. The film made the lake appear to be located directly behind Mount Rushmore when in reality it is actually five miles southwest of Mount Rushmore.
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