In 1946, the Agno River Development Program was launched to construct six hydropower facilities along the Agno River. The Ambuklao Dam was built in 1956 while the second facility, the Binga Dam, was completed in 1960. On November 25, 1966, President Ferdinand Marcos issued Proclamation No. 120 declaring the immediate upstream and downstream of the Ambuklao Dam including a portion of the Mount Data National Park traversed by the Agno River as part of a new protected area, the Ambuklao Watershed Forest Reserve. In 1987, a portion of the forest reserve containing Luzon's highest peak, Mount Pulag, Mount Tabeyoc, Mount Panotoan and four other adjacent peaks were set aside as the Mount Pulag National Park.