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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.
James E. Roberts (November 30, 1930 - July 6, 2006) was a noted American civil engineer. He was recognized with industry and government awards for his leadership in bridge engineering, especially in the area of seismic retrofit.
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 ...
One of the common formats for postmiles are located on a freeway on bridges over cross streets. According to Caltrans, it displays the name of the bridge, the county and route number, and the postmile. [6] The postmile is often painted onto the piers and/or abutments of bridges and overpasses.
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).
The five-lane bridge featured the longest continuous box girder in the world [12] until it was surpassed by the Shibanpo Yangtze River Bridge in Chongqing, China, in 2008. [16] The bridge is the third largest orthogonal box in the country – the box is the center part of the bridge, between piers 18 and 21 over the main shipping channel.
Studies to widen the bridge were funded in 1987. [13] Caltrans rated the structural sufficiency of the Desmond Bridge at 43 points out of possible 100 in 2007. [14] Also, since the 1968 bridge roadway lacks emergency/breakdown lanes, multiple lanes would be shut down in the event of an accident, snarling traffic. [15]
Fernbridge, originally Eel River Bridge, [2] is a 1,320-foot-long (402.3 m) reinforced concrete arch bridge designed by American engineer John B. Leonard which opened on November 8, 1911 [3] [4] at the site of an earlier ferry crossing of the Eel River.