THE CONCRETE BRIDGE MAGAZINE

FALL 2011

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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ELEVATION The San Bernardino Mountains have long provided a key recreational outlet for the millions of residents populating the valleys and coastlines of sunny southern California. Big Bear Lake is situated approximately 100 miles east of Los Angeles in the San Bernardino National Forest at an elevation of 6752 ft. It is an idyllic mountain resort community and a major destination for year-round recreation. Fishing, boating, hiking, and camping are abundantly available during the warmer seasons, while skiing and other snow related activities are a real favorite of winter enthusiasts. Big Bear was established as a local re s o r t d e s t i n a t i o n i n 1 8 8 4 , a f t e r construction of the first dam and the subsequent establishment of a lake in a valley surrounded by picturesque mountain peaks. A larger capacity dam, impounding a 73,000 acre-ft lake, was constructed in 1912 and still stands today. History of the bridge San Bernardino County completed a concrete highway bridge crossing the dam to provide access directly to the resorts from the San Bernardino valley floor in 1924. The 351-ft-long, 21-ft-wide bridge carried two lanes of traffic with one narrow sidewalk. The bridge comprised 12 spans of four girders each. The girders were haunched concrete T-beams resting atop arched ribs attached to the face of the concrete dam. The girder depth varied from 2.5 ft at the center of the spans to 3.5 ft at the simply supported ends. During the Great Depression, the highway network crossing the San profile BIG BEAR BRIDGE / SAN BERNARDINO MOUNTAINS AT BIG BEAR LAKE, CALIFORNIA br IDgE DESIgN ENgINEEr: California Department of Transportation, Sacramento, Calif. pr IME CoNTrACTor: Flatiron West Inc., San Marcos, Calif. C oNCrETE SuppLIEr: Robertson's Ready Mix, Corona, Calif. poST-TENSIoNINg CoNTrACTor: AVAR, Fremont, Calif. AbuTMENT bEArINgS: D.S. Brown, North Baltimore, Ohio by Raymond W. Wolfe and Ali Asnaashari, California Department of Transportation, and Bill Jahn, city of Big Bear Lake A Time To ReplAce— constructing a Safer Tomorrow The Big Bear Bridge nears completion. All photos and drawings: California Department of Transportation. 22 | ASPIRE , Fall 2011 Book_Fall11.indb 22 9/29/11 11:59 AM

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