The Bureau of Reclamation announced May 2 it awarded a $3.2 million construction contract for dam safety modifications planned for 198.72-MW Folsom Dam, on California’s American River.
DD-M Crane and Rigging, Alameda, Calif., is to perform the work as part of a larger dam safety program. It will modify Dike 5, an earthen embankment on the north shore of Folsom Reservoir. Principal work will include partial removal of the downstream face of the dike to add filters and drains to control internal erosion.
Site preparation, including trail relocation and development of the contractor’s use area, will begin in May and continue until about Sept. 1. BuRec anticipates principal construction work on Dike 5 will begin after Sept. 1. It expects completion in spring 2009. Some construction activities will be limited to certain periods to maintain dam safety and operational and recreational requirements, BuRec said.
The work is part of a multi-year construction program to perform safety modifications at Folsom Dam and Reservoir. Another component involves building an auxiliary spillway to increase flood protection. Construction of the auxiliary spillway — being built as a Joint Federal Project by BuRec, the Corps of Engineers, California Department of Water Resources, and Sacramento Area Flood Control Agency -ï¿½ began in January. (HNN 1/21/08) Kiewit Pacific Co. of Concord, Calif., is construction contractor for the auxiliary spillway.
The auxiliary spillway is to address the hydrologic risk to Folsom Dam identified through BuRec’s Safety of Dams program. It also is to achieve the Corps’ objective to double the flood protection for the city of Sacramento, to a 200-year flood.