Hetch Hetchy Water and Power is responsible for maintaining 14 bridges located in the Cherry, Eleanor, and Hetch Hetchy region. A condition assessment has identified the need for rehabilitation and/or replacement (both due to age and to meet current seismic design criteria). Four of the fourteen bridges require substantial modification or replacement and have been combined into this project.
The current 10-year Capital Plan funds work for only two bridges: O'Shaughnessy Adit Access Bridge and Lake Eleanor Dam Bridge.
O'Shaughnessy Adit Access Bridge - The project is to install a new reinforced concrete plug downstream of the existing plug in Hetchy Adit
and rehabilitate O'Shaughnessy Adit Access Bridge including sub-structure retrofit and super structure replacement.
Projected final completion: May 2030
Eleanor Dam Rehabilitation - Mitigation alternatives will include improvements to increase spill capacity to safely pass the design
flood, installation of a liner on the upstream face of the dam, concrete repairs, valve replacement, and installation of
concrete lining and riprap for foundation armoring, and replacement of the existing bridge.
Projected final completion: Subproject A - December 2026; Subproject B - December 2037
The project is part of a larger Hetchy Capital Improvement Program (HCIP), a multi-year capital program to upgrade or improve water conveyance, water storage, and power generation facilities in the Sierra Nevada portion of the Hetch Hetchy Regional Water System.
