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The Hacienda
1725 College Ave
Santa Ana, CA 92706
(714) 558-1304

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Thursday, March 01, 2018, 6:00 PM - 8:30 PM PST
Category: Regional Dinner Meeting

Southern California Regional Dinner Meeting with ASCE-GI Orange County

Date & Time: Thursday March 1, 2018, 6pm - 8:30pm

Oroville Spillway Damage & Repair

Presented by Holly Nichols, Department of Water Resources

On February 7, 2017, a hole formed in a portion of the concrete-lined spillway at Oroville Dam.  Continued operation of the gated spillway caused additional erosion and damage to the concrete structure.  The areas of deepest erosion occurred in portions of the spillway that were mapped during original construction as strongly weathered to decomposed amphibolite rock.  On February 12, 2017, during operation of the emergency spillway, rapid, deep headward erosion was observed in the northern portion of the unlined emergency spillway.  This presentation will discuss the geologic conditions that were understood at the site prior to construction, the geologic conditions that were documented during construction, the geologic exploration completed since the spillway failure, and the spillway reconstruction design, construction, and status.

Holly Nichols has been with the California Department of Water Resources since 2008, after working in the private sector for several years in Southern California.  She is currently a Senior Engineering Geologist in DWR’s Division of Engineering.  She has worked on a variety of water infrastructure design and construction projects including pipelines, canals, and dams throughout California’s State Water Project.  She received her B.S. in Geology from the University of Texas in Austin, and her M.S. in Geology from Washington State University, and is a licensed Engineering Geologist in California.  She has been AEG’s Sacramento Chapter Vice Chair for several years and has spent most of 2017 as the lead geologist for the Oroville Spillway Recovery efforts.

We are pleased to welcome ASCE-GI members to this event at our member price! We expect a large turn-out so register early.

Cost: $45/CalGeo & ASCE-GI members, $60/non-members. Payment must be received in advance, no cash or checks accepted at the door. You may use the Invoice me option at check-out to print an invoice and submit payment via check at least 10-days in advance of the event.

Register Now!

Thank you to our generous bar sponsor, Hayward Baker for providing drinks during the social hour before dinner. Come early and connect with your colleagues.


Contact: Kelly Cabal, kelly@calgeo.org (949) 391-2436 with any questions.