From WikiPilipinas: The Hip 'n Free Philippine Encyclopedia
The Ambuklao Dam is located along the Agno River which is the longest waterway in Luzon. During the 50's the Ambuklao dam was the highest and biggest in the Far East. It is made of earth and rockfull which measures 129 meters in height and 452 meters in length. The elevation of its crest is 758 meters and the roadway that runs through the top of the dam has an elevation of 756 meters. There are 8 Tainter radial gates at the dam's spillway. Each spillway measures 12.5 meters by 12.5 meters and is 127 meters in length. The gross storage capacity of the dam's reservoir is 327,170,000 cubic meters and it has a usable storage capacity of 258,000,000 cubic meters. The drainage area is 686 square kilometers and is 11 km long with a maximum width of 1 km.
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