From the Department of Water Resources:
Today the Department of Water Resources (DWR) provided an update on construction work on the Lake Oroville Spillways Emergency Recovery Project.
Continued Construction on the Main Spillway
- Construction efforts at the Lake Oroville spillways remain focused on repairing and reconstructing the gated flood control spillway, also known as the main spillway, by November 1. DWR and its partners are on schedule.
- DWR has passed the midway point of its construction timeline on the main spillway. Demolition began 96 days ago, on May 19, and 70 days remain until November 1.
- Demolition, excavation and preparation is now complete for the 2,270 feet of the main spillway that will be reconstructed this year.
- Construction of the 1,050-foot middle section of the spillway chute, including filling in the two scour holes, is now about 20 percent complete, with approximately 60,000 cubic yards of roller-compacted concrete placed.
- Placement of reinforced, structural concrete is 25% complete. Crews have placed 25 slabs of structural concrete so far. When it is complete, there will be 1,220 feet of spillway chute with structural concrete – 870 feet on the upper portion of the spillway and 350 in the lower portion of the spillway.
- Installation of reinforcing steel wall frames has begun and the first concrete wall section will be completed this week.
Construction at the Emergency Spillway
- DWR continues to make progress at the emergency spillway, and is still on schedule to complete construction of the secant pile wall, or cut-off wall, in late December 2017 or early January 2018.
Other Updates
- DWR crews this week performed weed abatement on the vegetation area on the face of the Oroville Dam. This routine maintenance is necessary for DWR to have clear access for observation.
- The independent Board of Consultants will meet for the eleventh time with DWR tomorrow and Friday.
- The Forensic Team will visit the spillways site later this month to receive a progress update on construction.
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