Folsom Dam Auxiliary Spillway, Phase IV

Location: Folsom, CA Project Owner: U.S. Army Corps of Engineers The spillway, a cooperative effort between the U.S. Army Corps of Engineers and the Department of the Interior, prevents overtopping of the Folsom Dam while providing downstream Sacramento protection against 200-year flood events. Kiewit and the USACE team used aerial drones to scan and map cleaned rock surfaces prior to the placement of the dental concrete. Conventional geologic mapping methods were impractical and ineffective due to difficult access in many areas. The use of drones made the operation much safer and produced a higher quality surface.