FALL 2008

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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Page 49 of 71

The existing steel truss bridge, built in 1932, over the Russian River in Geyserville, Sonoma County, Calif., was severely damaged during a series of storms in the last two weeks of December 2005. A maintenance crew from the California Department of Transportation (Caltrans) observed lateral rotation of a mid-channel pier and approximately 8 in. of differential settlement between the upstream and downstream sides. The bridge was closed to traffic on January 1, 2006, causing hardship to the local community. It is the shortest route to the high school on the other side of town and closure of the bridge resulted in a 40-minute detour every school day. Caltrans studied the options of repairing or replacing the bridge. After site geology and scour mitigation studies were completed, Caltrans decided to replace and re-open the bridge to traffic before the next school year. The replacement bridge layout was to have the same overall length, profile, and vertical clearance over the channel as the existing bridge. Matching the existing layout was made mainly to minimize the time in acquiring right of way and to keep the number of permits to a minimum. Raising the bridge profile and consequently extending the bridge length would have led to legal issues. profile russian river Bridge / GeYseRville, sonoMA CountY, CAliF. EnginEEr: California department of transportation, sacramento, Calif. PrimE contractor: CC Meyers inc., Rancho Cordova, Calif. c ontractor's consultant: R.n. valentine inc., Gualala, Calif. Pr E castEr: Con-Fab California Corporation, lathrop, Calif., a PCi-certified producer AwArds: ASCE, Bridge Project of the Year, Region 9 (California), 2007; Associated General Contractors, Excellence in Partnership Award, San Francisco Chapter, 2007 By Ahmed M. M. Ibrahim, Linan Wang, Tariq Masroor, Minh Ha, and Ofelia Alcantara, California Department of Transportation RUSSIAN RIVER BRIDGE EMERGENCY REPLACEMENT OF THE The Russian River Bridge uses non- standard double-tee beams. Photos: Steve Hellon and John Huseby, Caltrans. The double-tee beams were post-tensioned over a length of 980 ft. Dimensions of the non-standard double-tee beam. Drawing: Ahmed M. M. Ibrahim. 48 | AsPiRe , Fall 2008 ASPIRE_fall08.indb 48 9/15/08 4:29:00 PM

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