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San Diego–Coronado Bridge

San Diego–Coronado Bridge
San Diego Coronado bridge01.JPEG
Coordinates 32°41′11″N 117°09′30″W / 32.6865°N 117.1583°W / 32.6865; -117.1583Coordinates: 32°41′11″N 117°09′30″W / 32.6865°N 117.1583°W / 32.6865; -117.1583
Carries 5 lanes of SR 75
Crosses San Diego Bay
Locale San Diego and Coronado, California
Maintained by Caltrans
ID number 57 0857
Characteristics
Design Orthotropic deck on box girder
Material Prestressed concrete and steel
Total length 11,179 feet (3,407 m) or 2.1 miles (3.4 km) (including approaches)
Width 63 feet (19 m) between curbs
Longest span 660 feet (200 m)
No. of spans 32
Piers in water 21
Clearance below 200 feet (61 m)
History
Successful competition design 1978 World Bridge Beauty Contest
Constructed by Murphy-Pacific
Fabrication by Murphy-Pacific
Construction begin February 1967
Construction cost US$48 (equivalent to $313 in 2016) million
Opened August 3, 1969
Replaces San Diego and Coronado Ferry
Statistics
Daily traffic 75,000 (2009)
San Diego–Coronado Bridge is located in San Diego
San Diego–Coronado Bridge
San Diego–Coronado Bridge
Location in San Diego

The San Diego–Coronado Bridge, locally referred to as the Coronado Bridge, is a prestressed concrete/steel girder bridge, crossing over San Diego Bay in the United States, linking San Diego with Coronado, California. The bridge is signed as part of State Route 75.

In 1926, John D. Spreckels recommended that a bridge be built between San Diego and Coronado, but voters dismissed the plan. The U.S. Navy initially did not support a bridge that would span San Diego Bay to connect San Diego to Coronado. They feared a bridge could be collapsed by attack or an earthquake and trap the ships stationed at Naval Base San Diego. In 1935, an officer at the naval air station at North Island argued that if a bridge was built to cross the bay then the Navy would leave San Diego.

In 1951–52, the Coronado City Council initiated plans for bridge feasibility studies. By 1964 the Navy supported a bridge if there was at least 200 feet (61 m) of clearance for ships which operate out of the nearby Naval Base San Diego to pass underneath it. To achieve this clearance with a reasonable grade, the bridge length was increased by taking a curved path, rather than a more direct path to Coronado. The clearance would allow an empty oil-fired aircraft carrier to pass beneath it – it is not sufficient for Nimitz-class nuclear aircraft carriers in light load condition.

The principal architect was Robert Mosher. Construction on the San Diego–Coronado Bay Bridge started in February 1967. The bridge required 20,000 tons of steel (13,000 tons in structural steel and 7,000 in reinforcing steel) and 94,000 cubic yards of concrete. To add the concrete girders, 900,000 cubic yards of fill was dredged and the caissons for the towers were drilled and blasted 100 feet into the bed of the bay.

The bridge opened to traffic on August 3, 1969, during the celebration of the 200th anniversary of the founding of San Diego. The 11,179-foot-long (3,407 m or 2.1 mi) bridge ascends from Coronado at a 4.67 percent grade before curving 80 degrees toward San Diego. It is supported by 27 concrete girders, the longest ever made at the time of construction.


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