Construction on the world's largest dam-raise project of its kind wrapped up this summer, providing the San Diego County Water Authority with an additional 152,000 acre-ft of water, more than doubling the capacity of the St. Vincente reservoir.
The project involved removing two inches from the surface of the original St. Vincente dam, then using roller-compacted concrete to add—in layers, one on top of the other—an additional 117 ft up from the new foundation. The new dam stands at 337 ft tall.