Kepler Lake (French: Lac Kepler) is a reservoir located in Northwest Louisiana, USA. It is about 5 miles (8.0 km) from Castor, 4 miles (6.4 km) from Jamestown, 6 miles (9.7 km) from Bienville and about 12 miles (19 km) from Gibsland, Louisiana. Kepler is an open lake available for fishing and boating. Kepler's spillway drains into Black Lake Bayou which drains into Black Lake in Natchitoches Parish. Piney Woods Road is the only road that crosses Kepler. The Kepler spillway is located on the south side of the lake. Kepler has several boat launches and landings used for camping.