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OROVILLE DAM SPILLWAY INCIDENT — GEOLOGICAL AND GEOTECHNICAL INVESTIGATIONS FOR RECOVERY DESIGN FEATURES* Holly Nichols Lead Geologist - Oroville Spillway Recovery, California Department of Water Resources Michael Gray Senior Principal Geologist, Lettis Consultants International, Inc. Craig Hall Principal Geotechnical Engineer, GEI Consultants Leslie Harder Senior Professional Associate, HDR Ted Craddock Project Manager, California Department of Water Resources UNITED STATES OF AMERICA 1. INTRODUCTION Oroville Dam is located on the Feather River in northern California (USA). At 234.7 m (770-ft) tall, this earth embankment is the tallest dam in the United States. With its 4.3 billion m3 (3.5 million acre-feet) of storage, Lake Oroville is the second largest reservoir in California, supplying water to cities as far south as Los Angeles. The Oroville Dam, reservoir (Lake Oroville), and hydropower plant facility is the flagship of the State Water Project (SWP), which is owned and operated by the State of California, Department of Water Resources (DWR). 102