This is one in a series of videos looking back at big stories in Sacramento-area history. This one took place on Feb. 18, 1986, when the cofferdam built in preparation for the construction of Auburn Dam collapsed above Folsom Lake.
Video created by David CaraccioSacramento Bee and Department of Water Resources photos
The Department of Water Resources are using controlled blasting methods to break up intact rock on the slopes along the damaged gated flood control spillway at Oroville Dam. Crews report they're a week ahead of schedule, which is important with a wet season deadline that's just months away.
The reconstruction of Oroville Dam’s flood-control spillways is taking place, and California officials vow the structures will become stronger and safer than ever. Here's a look from above in a video taken this week.
With the spillway gates closed, Kiewit Infrastructure begins demolition work on the lower chute of the spillway. This area, shown on May 21, 2017, is known as “The Bridge” for the stretch of concrete that spans the erosion area beneath it. Reconstruction efforts will be conducted in phases, the Department of Water Resources said. This year’s work will focus on rebuilding the upper and lower portions of the main spillway and creating a cut-off wall on the emergency spillway. DWR's goal is to get systems in place by Nov. 1, 2017, to ensure safe management for the winter weather.
An updated look (May 16, 2017) shows the Kiewit Corp. mobilizing for repair work at the Oroville Dam spillway boat launch parking lot, the main spillway flowing at 20,000 cubic feet per second, and the continued excavation of the left slope to allow access into the canyon for repair work.
The California Department of Water Resources restarted the outflow from the Lake Oroville flood control spillway on Wednesday morning (May 11, 2017) at 9 a.m. beginning with water flows at 1,000 cubic feet per second and holding at 30,000 cfs by 1:20 p.m. The water flowed into the Feather River. The agency said it is lowering the reservoir to a level that will provide ample flood control storage through the run-off season so that construction of the spillway can begin as soon as possible.
This video features a close-up look at the damage to the lower portion of the flood control spillway and the rock formation exposed by the flows. Crews assess the existing concrete and geology of the canyon rock ahead of the May 10, 2017, spillway flow releases and the upcoming construction phase.
The Truckee River at Lake Tahoe is flowing at approximately 1,600 to 1,700 cubic feet per second, reports the National Weather Service California Nevada River Forecast Center. Warm weather has increased snowpack runoff in early May.