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remaining responsive and adaptable to the iterative design process needed to execute the spillway repairs under the very short timeframe. Active, on-site coordination and QA/QC procedures were critical to the successful implementation of the field exploration program. Although there were daily challenges, the experienced on-site engineering geologists and geotechnical engineers remained flexible and good humored throughout. The configuration of real-time, accessible instrumentation readings allowed the close monitoring of potential slope instability and changes in groundwater conditions. Placing the instrumentation data in one centralized location that was easily accessible by anyone on the team at any time provided the ability to examine short- and long-term performance trends quickly and remotely. Centralized data storage was essential for time-critical information to be accessible by the design team as needed. ACKNOWLEDGMENTS The authors wish to acknowledge many firms and/or entities who assisted with the geologic and geotechnical exploration program: DWR engineering geologists from several divisions, state-wide; Lettis Consultants International, InfraTerra, the United States Bureau of Reclamation, the United States Army Corps of Engineers, Gregg Drilling and Testing, Cascade Drilling, Ruen Drilling, GeoVision Geophysical Services, Gasch Geophysics, NorCal Geophysical (with Terracon), GEI Consultants, Spectrum Petrographics, Cooper Testing Laboratory, Blackburn Consulting, Willamette Geological Service, and Syblon Reid Contractors. Specifically, thank you to Nick Hightower, Bryan Dussell, and Andy Tate, who organized the field teams and were instrumental in successfully executing this enormous exploration program. REFERENCES [1] SAUCEDO G.J., WAGNER D.L. Geologic Map of the Chico Quadrangle, California. California Geological Survey, Regional Geologic Map No. 7A, 1:250,000 scale, 1992. [2] CROYLE B., GUTIERREZ D., ANDERSEN M., TAPIA S., BLACKETT F. Oroville Dam Spillway Incident – Situation Development, Incident Response, and Public Safety. ICOLD World Congress Proceedings, 2018. 119