Folsom Aux Spillway rendering

Folsom Auxiliary Spillway Photos

Construction Photos:

Project Summary
The Folsom Dam Auxiliary Spillway project is an approximately $900-million cooperative effort between the U.S. Army Corps of Engineers, U.S. Bureau of Reclamation, State of California and SAFCA that will help the Sacramento region achieve 200-year level of protection, meaning there will be a one-in-200 chance for flooding in any given year.

The project will will allow water to be released earlier and more safely from Folsom Lake during a high water event.

The spillway will include an 1,100-foot-long approach channel that will funnel the water from the lake into the spillway; a control structure with six submerged gates that will be controlled in coordination with the gates on the main dam to control water releases; a 3,027-foot-long spillway chute that transports the water from the control structure to the American River below; and a stilling basin that will slow the racing water back to normal flow levels that the river channel will be able to withstand.

The auxiliary spillway is scheduled to be completed in late 2017.

Additional information can be found on the U.S. Army Corps of Engineers Folsom Dam Auxiliary Spillway web page.