Williamstown Lake is a public 333-acre (1.35 km2) recreational lake and water reservoir in Grant County, Kentucky. It was created in 1955 by impounding the South Fork of Grassy Creek. The lake officially opened for boating, fishing and swimming in 1957. With more than 20 miles of shoreline, over 300 summer cottages and year-round homes line the lake. Residents and vacationers enjoy yearly events such as the Labor Day Boat Parade and Paddle Williamstown, among other summer festivities.
There are two main public boat ramps available- The Williamstown Marina and Ruby's Boat Dock. Both offer fuel and small convenience stores, and The Williamstown Marina also delivers pizza and subs to docks.
Major issues surrounding Williamstown Lake include the Williamstown Lake Expansion Project and the nearby development of the Ark Encounter attraction. The Expansion Project is expected to triple the size of the lake in order to increase the supply of safe water in the surrounding areas. The Ark Encounter is an attraction being developed by Answers in Genesis, the makers of the Creation Museum in Hebron, Kentucky. Some Williamstown Lake property owners worry how this major attraction will affect the lake's water levels.