Water Storage Project:

Lower Crystal Springs Dam Improvements

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  Concrete placement for the new and improved ogee crest spillway. Spillway modifications included widening the spillway, constructing two bridge piers for reconstruction of the San Mateo County Bridge, constructing a new weir system, installing access cat-walks for operation and maintenance, and eliminating water ponding on top of the dam.

Concrete placement for the new and improved ogee crest spillway. Spillway modifications included widening the spillway, constructing two bridge piers for reconstruction of the San Mateo County Bridge, constructing a new weir system, installing access cat-walks for operation and maintenance, and eliminating water ponding on top of the dam.

The Lower Crystal Springs Reservoir System is the primary water storage facility for emergency backup and supplementary water supply for the entire San Francisco Peninsula. This WSIP project included critical improvements effectively increasing the water capacity of the Upper and Lower Crystal Springs Reservoirs to 22 billion gallons.  

ECS’s cost, scheduling, and office engineering roles on the Construction Management team helped keep this complex project on budget and on schedule.  The American Public Works Association (APWA) Northern California Chapter awarded this project its 2013 Project of the Year (for projects between $5 and $25 million).  Successful completion of the dam improvements within the constricted construction window minimized environmental impact and now assures that the SFPUC can provide minimum water service to one million residents of San Francisco and San Mateo County within 36 hours of a major earthquake.

A view of the top of the Lower Crystal Springs Dam during construction of the new parapet wall, effectively raising the maximum elevation and increasing the overall capacity of the Lower Crystal Springs Reservoir.

Night work at the bottom of the Lower Crystal Springs Dam, showcasing modifications at the base of the spillway that included construction of this substantially larger basin. 

A look back at the completed Lower Crystal Springs Dam Improvements.  The environmentally-sensitive San Mateo Creek area at the base of the dam was replanted and restored.


ECS  |  290 Division Street, Suite #307, San Francisco, CA 94103  |  (415) 934-8790