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Engineering : A. D. Edmonston Pumping Plant Pump Replacement

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Division of Engineering
Department of Water Resources

Sacramento, CA 95814

(916) 653-3927


Completed in 1974, A. D. Edmonston Pumping Plant is the highest lift pumping plant in the State Water Project.  With 14 pumps rated at 320 cubic feet per second, Edmonston lifts water 1,926 feet to cross the Tehachapi Mountains in a series of tunnels and inverted siphons.  Each pump is a vertical shaft, four stage, centrifugal unit powered by an 80,000 horsepower synchronous motor.  When initially completed, only 11 of the 14 pumps were installed.  Four of the eleven were built by Allis-Chalmers and seven were built by Baldwin-Lima-Hamilton.  In the early 1980’s, the three remaining pumps, built by J. M. Voith, were installed.  Due to declining efficiency caused by nearly continuous operation, the Allis-Chalmers pumps are being replaced with new pumps designed and being built by Hitachi America, Ltd.  Components for the first of the new pumps are currently being uncrated and prepared for assembly at the pumping plant.  Installation of all four pumps is expected to be complete by March 2011.