Bolarque Dam (Spanish: Presa de Bolarque) is a concrete gravity dam on the Tagus in Spain, where the river forms the border between the provinces of Cuenca and Guadalajara. About 6 km downstream from the dam is the José Cabrera Nuclear Power Station. Work on the dam began in 1907. In 1908 more than 1300 workers were employed at the construction site. The dam was officially inaugurated on June 23, 1910 by king Alfonso XIII. It is owned by Unión Fenosa.