The Lower Agno Watershed Forest Reserve is a Philippine protected area that straddles the Cordillera and Ilocos regions encompassing land from the provinces of Benguet and Pangasinan.

[1][2] Lower Agno was initially part of the 699,206.09-hectare (1,727,775.9-acre) Central Cordillera Forest Reserve established on February 16, 1929 through Proclamation No.

217 issued by Governor-General Henry L. Stimson, which declared 81.8% of the entire Igorot minority lands in the Cordilleras as protected area.

An initial 39,304 hectares (97,120 acres) of the Cordillera Central Forest Reserve was set aside for water resource protection and conservation by the Ministry of Natural Resources–Bureau of Forest Development, with 9,550 hectares (23,600 acres) reserved for the multi-purpose dam project of the National Power Corporation approved by President Ferdinand Marcos on May 5, 1981.

[14] Lower Agno is bounded to the west by both operating and abandoned gold and copper mining areas.

The gold mining company also operates the Antamok, Baco and Kelly sites along the Ambalanga River just east of Baguio and the Balatoc Mill.

[14] The Pinus kesiya (Benguet pine) is the most dominant vegetation in the tropical subalpine forests of the reserve.