Centennial Lake is a man made 50-acre (200,000 m²) reservoir, in a 325-acre (1.32 km²) park in Howard County, Maryland, near Columbia, Maryland and Clarksville, known as Centennial Park. It was created by damming the Centennial Branch of the Little Patuxent River. The lake and the park feature a dam, a wildlife area, a walking trail, boating, fishing, and other recreational activities.