Granite has been awarded an approximately US$50m contract by Pacific Gas and Electric (PG&E) to replace the spillway at Tiger Creek Regulator Dam in Amador County, California.
The project forms part of PG&E’s Mokelumne River Hydroelectric Project and will replace the existing spillway at the slab-and-buttress dam, which was originally constructed in 1931. According to the companies, the new spillway is intended to improve long-term dam safety, operational reliability and compliance with current regulatory and engineering standards.
Granite’s work includes construction of a new spillway crest structure and chute, installation of a temporary cofferdam to enable dry working conditions, excavation and rock anchoring, placement of mass and structural concrete, and decommissioning of the existing spillway. The contract also includes improvements to site access, including construction of a permanent access road for future maintenance.
The contractor previously completed a separate preconstruction contract for the project in 2024, valued at approximately US$600,000, covering early planning and constructability activities.
“We have a long history of building critical dam projects for many clients in Northern California including the Folsom Dam Auxiliary Spillway Control Structure, Mormon Island Auxiliary Dam, Lost Creek Dam, and Log Pond Dam,” says Bob Mihal, Granite Area Manager. “Our team brings deep technical expertise and a collaborative approach, and we look forward to serving PG&E and strengthening our partnership on critical infrastructure that supports the region’s communities.”
Construction began in May 2026 and is expected to be completed in May 2028.
