Workers settle concrete
Workers settle concrete atop the Folsom Dam auxiliary spillway’s new control structure July 26, 2013 in Folsom, Calif. Concrete is placed at night in 5-feet-deep layers called lifts. The concrete must cure for up to three weeks before another section can be placed.

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Tags: Folsom Dam
Photo by: Capt. Michael N. Meyer |  VIRIN: 130726-A-GD309-920.JPG