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Published on 9/28/2018

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Deadline nears for Oroville Dam spillway concrete placement

The state Department of Water Resources still expects to have all concrete placed on the Oroville Dam’s main spillway on time

Deadline nears for Oroville Dam spillway concrete placement

Source: chicoer.com

By RISA JOHNSON | rjohnson@chicoer.com | Chico Enterprise-Record

PUBLISHED: September 26, 2018 at 6:18 pm | UPDATED: September 26, 2018 at 6:19 pm

Bill Husa — Mercury-Register

Construction continues on the Oroville Dam spillway on Tuesday. The state Department of Water Resources expects to meet its Nov. 1 deadline to have all concrete placed on the main spillway.

OROVILLE — The state Department of Water Resources still expects to meet its quickly approaching Nov. 1 deadline to have all concrete placed on the Oroville Dam’s main spillway.

Crews began by placing permanent concrete slabs at the bottom of the spillway of the nation’s tallest dam, making their way to the top. Now, the upper chute is about three-quarters of the way complete, DWR reported in a moderated media call on Wednesday.

In the uppermost 730 feet of the chute, 108 of 150 erosion-resistant concrete slabs and 14 of 50 erosion-resistant concrete walls have been installed.

Jeff Petersen, executive project director for Kiewit Infrastructure West Co., said  crews had made “great progress” on the middle chute since the last update, with the section now 95 percent finished.

All of the walls and 221 of 228 of the erosion-resistant slabs in the middle chute have been placed. One slab that was affected by hot and dry winds needs to be replaced as it didn’t meet DWR standards, but that shouldn’t affect the deadline, Petersen said.

Work on the energy dissipators or dentates at the bottom of the spillway, which were demolished and are now being rebuilt, is 65 percent complete, the department said.

After the Nov. 1 deadline, there will still be some activity on the main spillway including dry finishing, joint sealing and cleanup. Concrete placement will continue on the emergency spillway.

Placement of roller-compacted concrete on the southern half of the emergency spillway splash pad is 83 percent complete, according to DWR. Concrete placement there resumed on Sept. 10 after breaking for scheduled maintenance on the roller-compacted concrete batch plant, the department said.

Construction of a roller-compacted concrete buttress which will be adjacent to the splash pad and the emergency spillway weir is expected to begin in October.

These are measures to mitigate the dangerous type of erosion that occurred during the spillway crisis in February 2017, when water ran down what was then an unlined hillside for the first time in history.

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Tags: concrete concrete news concrete spillway concreting USA dam projects water resources

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