Blasting tied to construction of the new spillway at Folsom Dam will force short-term closure of the bridge just downstream over the next two weeks.
The blasting operations, which was scheduled to begin Tuesday night, are being conducted to clear rock from the outlet of the auxiliary spillway so water can flow from the spillway to the American River.
Blasting will take place from 7 to 8 p.m. weeknights until July 15. The blasting will cause temporary roadway and bike trail closures along Folsom Lake Crossing Road between Folsom-Auburn Road and Natoma Street.
Bike trail closures start at 6:30 p.m. Road closure begins at 7 p.m.
Warning signals will alert the public of impending blasts: five long horn soundings for five-minute warning, 20 short soundings for one-minute warning and one long horn sounding for all clear.
The Folsom Dam Auxiliary Spillway construction project is being done to reduce flood risk for the Sacramento region. The auxiliary spillway project should be completed in October 2017.