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Raystown Lake is the largest lake that is entirely within Pennsylvania. The original lake was built by the Simpson family of Huntingdon (1905) as a hydroelectric project. The current 8,300-acre (34 km2) Raystown Lake was completed in 1973 by the Army Corps of Engineers. Raystown is around 200 ft deep in the deepest area near the dam. The lake was created primarily to control floods, provide electricity, and support recreational activities. Boating, swimming, mountain biking, scuba diving, and fishing are all popular activities. There are many campsites on the lake, as well as several boat launches, restaurants, and trails. Firework displays are held at the Raystown Lake Resort on Memorial Day Weekend, July 3, and the Sunday night before Labor Day. The fireworks at the resort are watched from the lake but can also be seen from the Pennsylvania Route 994 bridge; the resort is just south of this bridge.