Photo by The California Department of Water Resources


incredible team together and work towards a common goal, together you’ll accomplish uncommon things.”


RESET THE CLOCKS: 176 DAYS Te project’s second phase officially


began on Nov. 2, 2017. In Phase 2, construction crews once again need to overcome numerous challenges and accomplish two lofty goals before the next milestone — bringing both the main spillway and the new emergency spillway to final construction. On May 8, 2018, Kiewit regained


full access to the main spillway and reset its countdown clock for Phase 2. To meet its new Nov. 1 milestones, Kiewit has 176 days to demolish and rebuild the top 730 feet of the upper chute; bring the middle chute to final design by placing a 3-foot-layer of erosion resistant concrete over the RCC and replace the temporary RCC walls with permanent structural concrete walls. Additionally, the energy dissi-


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paters at the end of the spillway are being hydro-blasted and resurfaced. Once the main spillway is constructed to final design, it will be able to handle flows up to 270,000 cfs. Almost 350,000 cubic yards of


RCC were used on the main spillway’s middle chute in Phase 1. For Phase 2, the emergency spillway system requires almost double that amount of RCC. Crews cleaned nearly 80,000 square yards of rock foundation in Phase 1. During Phase 2, crews will clean 160,000 square yards of rock foundation. “During the winter, when we were


unable to access the main spillway, we concentrated our efforts on the emergency spillway construction,” said Kiewit Project Director Todd Orbus. Tose efforts included completing


construction of the secant pile wall, an underground wall of 605 individual 36-inch diameter piles, built into bedrock at depths of 35 to 65 feet. “If the emergency spillway is used


in the future, the secant wall, the 850-foot-long crest cutoff wall and the 10-foot-thick RCC splash pad will prevent the kind of uphill erosion and scouring that occurred last February,” he said. More than 1 million tons of


aggregate will be crushed in Phase 2 to produce the amount of RCC necessary to finish the emergency spillway buttress and apron by December 2018. “With a significant amount of work


happening in both spillways, we have even more to accomplish this year than we did last year,” Orbus said. “Not only are we bringing that same passion, drive, motivation and momentum that we had in Phase 1, this year we’re also bringing our experience from last season and knowledge from the lessons we learned in the first phase. We’re proud of what we’re accomplishing at Oroville.” 


(Article courtesy Kiewit Infrastructure West Co.) Associated General Contractors of California 19


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