Big Screen Debut

by Howard O. Wilson, P.E., (M.ASCE), Sr. Proj. Mgr.; CH2M HILL in Redding, CA,
Lauren B. Carly, P.E., Proj. Mgr.; U.S. Bureau of Reclamation in Willows, CA,
Rich Zito, P.E., (M.ASCE), Proj. Mgr.; Shimmick Construction Company, Inc., Hayward, CA,
Cynthia F. Davis, Glenn-Colusa Irrigation District, Willows, CA,

Serial Information: Civil Engineering—ASCE, 2001, Vol. 71, Issue 10, Pg. 58-63

Document Type: Feature article


The Glenn-Colusa Irrigation District (GCID) encompasses nearly 150,000 acres (60,700 ha) of prime agricultural land in California's Sacramento Valley, generally considered to have some of the world's most fertile farmland. In an average year, the GCID delivers more than 700,000 acre-ft (863 million m�) of water to this farmland. On a GCID-maintained oxbow of the Sacramento River, the Hamilton City pumping plant lifts up to 3,000 cfs (85 m�/s) of water into the 65 mi (105 km) long Glenn-Colusa main canal. Over the years the plant has been regarded as an important cause of salmon mortality, and since the 1920s at least four attempts have been made to screen the water diversion structure. Now a flat-plate fish screen extension that will make the screen the longest of its type in the world is set to significantly improve that mortality rate. A concrete foundation supported by steel H piles forms the base for 26 ft (8 m) tall transverse pier walls. The H piles are spaced 36 ft (11 m) apart longitudinally, and the pier walls support precast-concrete deck beams. The structure serves both as a frame for the screens and as an access bridge above the water for maintenance vehicles.

Subject Headings: Walls | Urban areas | Steel piles | Spillways | Pumping stations | Pile foundations | Piers

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