Marsh Creek State Park is a 1,705 acres (690 ha) Pennsylvania state park in Upper Uwchlan and Wallace Townships, Chester County, Pennsylvania in the United States. The park is the location of the 535-acre (217 ha) man-made Marsh Creek Lake. With an average depth of 40 feet (73 feet at its deepest), the lake is stocked with fish and is a stop for migrating waterfowl. Marsh Creek State Park is 2 miles (3.2 km) west of Eagle on Pennsylvania Route 100.
Marsh Creek Lake is open to fishing and recreational boating. It is a warm water fishery with largemouth bass, black crappie, walleye, tiger muskellunge, and channel catfish all swimming in its waters. The lake is a designated "big bass" lake - only bass 15 inches (38 cm) and greater may be kept. Bass smaller than 15 inches (38 cm) must be released back into the lake.Gasoline powered boats are prohibited at Marsh Creek Lake. Boaters are restricted to using non-powered or electric powered boats. All boats must be properly registered with any state. Boat rentals including canoes, sail boats and paddle boats are available.