Shot with an Olympus E-500 camera using a 40mm lens, this aerial photograph of the downstream slope of the San Vicente Dam near San Diego shows construction crews in the process of raising the dam by 117 ft above its original 220 ft height.

Photographer: San Diego County Water Authority
San Vicente Dam near San Diego, Calif.

The seven-year project features the highest raise of a concrete dam using roller-compacted concrete in the world, according to design firm MWH Global.

When completed in August, the reservoir will be able to store an additional 152,000 acre ft of water. That will better enable the San Diego County Water Authority to carry over surplus water from rainy periods to sustain the region in times of drought.

Photographer: San Diego County Water Authority

Submitted By: MWH Global, Bellevue, Wash.