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Hetchy System Improvement Program (HSIP)

Cherry Dam outlet works
Cherry Dam outlet works

Early Intake Dam
Early Intake Dam

The Hetch Hetchy Water System delivers an average of 222 million gallons of high-quality drinking water per day to 2.6 million people in the San Francisco Bay Area. The system also generates enough clean, green, and reliable hydropower annually for the Modesto and Turlock irrigation districts, City of San Francisco facilities and services, and newly constructed homes and businesses in the redeveloped San Francisco Shipyard.

The Hetchy System Improvement Program (HSIP) is a $1 billion capital upgrade of numerous upcountry water transmission, hydroelectric generation and power transmission facilities essential to continued reliable delivery of both water and power. The program’s approximately 40 projects, varying in scope and complexity, address necessary work on water transmission, hydroelectric generation and power transmission facilities in Tuolumne, Mariposa, Stanislaus, San Joaquin and Alameda counties. Construction of some HSIP projects began in 2012, with the entire program scheduled for completion by 2025.

Contact Information

Michele Liapes
Phone: (415) 554-3211; (toll-free) (844) 554-7135


Current Projects

transmission lines at Don Pedro ReservoirDon Pedro Reservoir Crossing Transmission Lines

The SFPUC is currently raising the height of two transmission lines at the Don Pedro Reservoir crossing to increase the clearance between the transmission lines and the reservoir’s water surface elevation. The site is in the northeast section of Tuolumne County, along the SFPUC right of way approximately 6 miles west of Moccasin.

The scope of work includes: (1) the supply and installation of two 175-foot-tall and two 180-foot-tall steel monopole structures, (2) the supply and installation of new conductors and insulator assemblies, (3) the construction of structural modifications to one of the existing steel lattice towers, and (4) the demolition of 4 existing steel lattice towers.

The project is in the initial phase of construction and is scheduled to finish in spring of 2016.


San Joaquin Valley comms systemSan Joaquin Valley Communications System Upgrade

The SFPUC is currently upgrading its San Joaquin Valley communications system throughout the Valley. The project calls for the installation of several microwave towers, microwave equipment, and other electrical equipment along the SFPUC right of way to improve our existing radio communication system. The project will provide a modern, reliable, secure, and integrated communication and control system for our water and power transmission system operations across the Valley. Construction is under way, and completion is scheduled for the summer of 2016.

Last updated: 12/10/2015 11:26:33 AM