The San Roque Dam is a 200-meter-tall, 1.2 kilometer long embankment dam on the Agno River. It is the largest dam in the Philippines and sixteenth largest in the world. It spans the municipalities of San Manuel and San Nicolas in the province of Pangasinan. It is located about 200 km north of Metro Manila.
The dam impounds a reservoir with a surface area of about 12.8 square kilometers extending north into the municipality of Itogon, Benguet. A gated spillway protects the dam from overtopping. During the wet season, the run-off is stored for later release via water turbines to generate power and irrigate crops.
Agno River is the third largest river in the Philippines with a total length of 221 kilometers and a drainage basin at the Project site of 1,225 square kilometers. The river originates in the Cordillera Mountains, initially flows from north to south, divides into several channels in the flat central plain of Luzon and meanders westerly through the provinces of Pangasinan and Tarlac before emptying into the Lingayen Gulf.
