DWR Hits Nov. 1 Target for Oroville Spillway Repair by Pamela Martineau Nov 1, 2017 Water News Workers place leveling concrete on the upper chute of the Lake Oroville flood control spillway in Butte County, California. Photo taken August 30, 2017.Ken James / California Department of Water Resources After a massive construction effort, the main flood control spillway at Oroville Dam is up and running in time for the rainy season and on point for its Nov. 1 target for repair, officials with the California Department of Water Resources announced today. DWR set Nov. 1 as its goal for repairing and reconstructing more than 2,270 feet of the 3,000-foot-long main, gated flood control spillway at Lake Oroville so it could handle flows of 100,000 cubic-feet per second this winter. Preparing the main spillway for the rainy season was a primary objective of the Lake Oroville Spillways Emergency Recovery Project, which has now completed its first phase. “Today is a truly significant day for DWR, our state, federal and local agency partners, and the contractors who have worked together so well to meet this critical milestone,” said DWR Director Grant Davis. “It is also a very important day for the surrounding communities, and everyone who depends on the Oroville Dam facilities for flood protection. However, today is only a milestone and we have much more work to do before the project is complete, and we’re eager to begin phase two.” In April of this year, DWR awarded Kiewit Infrastructure West Co. (Kiewit) the contract to reconstruct both the main and emergency spillways. “More than 600 Kiewit workers, many of them from Butte County and other parts of Northern California, have put in over 720,000 hours to date since May this year to help deliver the first phase of this very important project on schedule,” said Jeff Petersen, Kiewit project director. “We take great pride in the speed in which the entire project team has worked safely and productively to meet expectations. Our commitment continues to be to deliver the highest quality, most reliable spillways that the communities in this region deserve.” In October, DWR released an operations plan for the 2017-’18 flood season that will guide reservoir operations between Nov. 1 and April 2018. The plan calls for DWR to maintain lower-than-average lake levels during the winter months to provide space for inflows and manage releases from the substantially reconstructed main spillway. More information on the project is available here.