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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.
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.
The MacArthur Maze [1] [2] [3] (or more simply the Maze; formally, the East Bay Distribution Structure [4]) is a large freeway interchange in Oakland, California.It splits traffic coming off the east end of the San Francisco–Oakland Bay Bridge into three freeways: the Eastshore (I-80/I-580), MacArthur (I-580) and Nimitz (I-880).
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 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 ...
The bridge is signed as part of State Route 154. It is currently the highest arch bridge in the U.S. state of California and among the highest bridges in the United States. At its highest point, the bridge deck is 400 ft (122 m) above the canyon floor. [1] [2] The bridge is also the largest steel arch bridge in the state. [3]