Project Overview
The San Roque, the tallest earth and rock-fill dam, has been called a "national flagship project." The dam is located in a remote, mountainous region on the island of Luzon that sees 80 inches of annual rainfall. The 345-Mw hydroelectric/water resource dam was constructed on an EPC, turnkey, and fast-track basis.
Washington Division managed the project and self-performed all civil construction work including spillway, powerhouse, and tunnel excavation; cofferdam and main dam embankment; spillway and powerhouse concrete structures; grouting, and tunnel lining.Highlights & Accomplishments:
- San Roque rises 200 meters—26 feet higher than the 630-foot-high Gateway Arch in St. Louis—and contains 41.5 million cubic meters of earth fill with a crest length of 1.1 kilometers and a 940-meter-wide base.
- Major components include three horseshoe-shaped diversion tunnels up to 15 meters high, 10 meters wide, and 901 meters long.
- In total, San Roque’s tunnels extend 8.5 kilometers for river diversion, grouting, drainage and power generation.
- Construction work sprawled over 4.5 square kilometers, and a 10.6-kilometer-long conveyor system transported earth for the seismically engineered structure.
- We constructed one of the largest conveyor systems ever built for this type of a project which doubled earthmoving production, handling over 7,000 tons an hour.