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The James E. Roberts Memorial Bridge is a 1,400 foot two-lane highway bridge along the California State Route 120/California State Route 49 concurrency, in Tuolumne County, California. The bridge spans the Tuolumne River just north of Lake Don Pedro, near the community of Chinese Camp. It opened in 1971.
The design proposed was an elevated viaduct consisting of reinforced concrete columns and precast concrete segment spans as seen in the illustration at right. The design criterion was that the new bridge should survive an 8.5 magnitude earthquake on any of several faults in the region (particularly the nearby San Andreas and Hayward faults).
With ship traffic projected to increase to require as many as 400 openings by 2035, [8] and traffic on State Route 12 also projected to increase, the City of Rio Vista, the Solano Transportation Authority, and Caltrans have all studied potential replacements for the Helen Madere Bridge. Two goals were first, to remove the drawbridge or at least ...
It is developed by the California Department of Transportation (Caltrans) Division of Safety Programs "in substantial conformance to" the national Manual on Uniform Traffic Control Devices developed by the Federal Highway Administration. The first edition of the CA MUTCD was published in 2006, replacing an earlier supplement to the national MUTCD.
In 1986, the Caltrans bridge survey found the Sixth Street Viaduct eligible for inclusion in the National Register of Historic Places. [ 2 ] The demolition of the predecessor bridge was due to serious structural issues, including several large cracks, resulting from the high alkaline content of the concrete composition, due to architectural ...
The Martel bridge was adopted by the British Army in 1925 as the Large Box Girder Bridge. [2] A scaled down version of this design, the Small Box Girder Bridge, was also formally adopted by the Army in 1932. This latter design was copied by many countries, including Germany, who called their version the Kastenträger-Gerät (K-Gerät for short ...
Back Channel, the Los Angeles River and downtown Long Beach, prior to the construction of the pontoon bridge. The first bridge linking the eastern end of Terminal Island and Long Beach was an unnamed "temporary" pontoon bridge constructed during World War II to accommodate traffic resulting from the expansion of the Long Beach Naval Shipyard.
The bridge construction included a new toll plaza with nine toll booths, two open road tolling lanes and one carpool lane at the south end of the bridge, although tolls continue to be charged only for northbound traffic. The old toll plaza at the north end of the bridge was removed.