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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. He was the state bridge engineer at Caltrans during the Loma Prieta earthquake and Northridge earthquake.
[6] [7] An estimated 48,000 cubic yards (37,000 m 3) of concrete, 1,245 tons of structural steel, and 4,200 tons of rebar were hauled away as construction began on the replacement. [8] The newly completed bridge is designed by architect Michael Maltzan and the HNTB Design-Build team and contractors Skanska and Stacy and Witbeck. [9]
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).
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.
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 ...
Jul. 28—For napping truck drivers, road trippers and those unable to ignore the call of nature, roadside rest stops are a vital function for travel. And according to Caltrans, the state's 87 ...
Caltrans District 7 Headquarters in Los Angeles, designed by Thom Mayne. Caltrans District 8 Headquarters in San Bernardino Caltrans headquarters in Sacramento. The earliest predecessor of Caltrans was the Bureau of Highways, which was created by the California Legislature and signed into law by Governor James Budd in 1895. [7]