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.
Video San Diego-Coronado Bridge
Description
Construction
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.
In 1970, it won an award of merit for long span bridge from the American Institute of Steel Construction. The five-lane bridge featured the longest continuous box girder in the world until it was surpassed by the Shibanpo Yangtze River Bridge in Chongqing, China in 2008. 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.
Tolls and tollbooths
Originally, the toll was $0.60 in each direction. Several years later, this was changed to a $1.00 toll collected for traffic going westbound to Coronado only. Although the bridge was supposed to become "toll-free" once the original bridge bond was paid (which occurred in 1986), the tolls continued for sixteen additional years. On June 27, 2002, it became the last toll bridge in Southern California to discontinue tolls, despite objections from some residents that traffic to the island would increase. The islands upon which the toll booths sat, as well as the canopy over the toll plaza area, are still intact, located at the western end of the bridge in the westbound lanes. Though tolls are no longer collected, beginning February 19, 2009 there was talk of resuming westbound toll collection to fund major traffic solutions and a tunnel. However nothing came of the discussions, and more recently there have been discussions of removing the unused toll plaza completely.
Lanes and traffic
The bridge contains five lanes: two eastbound, two westbound, and a reversible middle lane with a moveable barrier system installed in 1993 which can be used to create a third lane in either direction in response to traffic volume. The eastern end of the bridge connects directly to a T interchange with Interstate 5, just southeast of downtown San Diego. It is designated and signed as part of California State Highway 75. The bridge was designed entirely and exclusively for motor vehicle traffic; there are no pedestrian walkways, bike paths, or shoulders ("breakdown lanes"). Once a year beginning in 1986, a lane is opened to pedestrians for the Navy Bay Bridge Run/Walk, a fundraiser sponsored by and benefiting the Navy Morale, Welfare, and Recreation program. Beginning in 2008, cyclists have the once-a-year opportunity to ride over the bridge in the Bike the Bay "fun ride".
Artwork
The pillars supporting the bridge on the eastern end are painted with huge murals as part of Chicano Park, the largest collection of Chicano art murals in the world. This neighborhood park and mural display were created in response to a community uprising in 1970, which protested the negative effects of the bridge and Interstate 5 on the Barrio Logan community. Local artist Salvador Torres proposed using the bridge and freeway pillars as a giant canvas for Chicano art at a time when urban wall murals were rare in the United States, and he and many other artists created the murals when permission for the park was finally granted in 1973.
Maps San Diego-Coronado Bridge
Suicide bridge
It is the second deadliest suicide bridge in the USA, trailing only the Golden Gate Bridge in San Francisco. As of July 2017,over 400 lives have been lost to suicide on the bridge. [ ] Since 2010, annual suicide totals have increased more than 50%, when compared to the years preceding.[ ]
Solar-powered phones were once installed on the Skyway to offer direct help for those contemplating suicide, but have since been removed. Signs that inform potential 'jumpers' of the suicide crisis hotline (1-888-724-7240} is posted at the highest points of the bridge, but due to the fact that all sections on the bridge are used for lanes of traffic, the one and only call box remains at the base of the bridge, mounted against the buildings east wall.
November 2015; online support group created for witnesses of bridge suicides. [ ]
Data indicates that structures and locations known for being majestic in appearance, possessing grandeur, are unique, inspirational,, spiritual or historically significant, frequently become suicide "hot spots". [ ] suggestive that this may be the reason ,suicidal individuals choose this bridge, vs. other tall structures in close proximity.. .
After aggressive efforts made by Coronado San Diego Bridge Collaborative for Suicide Prevention, Caltrans agreed to fund and conduct a ten month low level feasibility study, scheduled to be completed in Feb., 2018. Barrier methods considered: Thistle barrier, vertical metal fencing, vertical metal fencing-curved inward, transparent acrylic panel and metal netting. [ ]
Since 2015, Memorial Services are offered by local clergy and CoronadoBridge.Net annually, in mid June, on behalf of victims and survivors. [ ]
One "suicide" was later determined to be a murder. Authorities determined that Jewell P. Hutchings, 52, of Cerritos had been forced to jump at gunpoint; her husband, James Albert Hutchings, was subsequently charged with murdering her and pleaded guilty to involuntary manslaughter.
The bridge's reputation as a suicide hotspot has also reached the realms of fiction. In the television series Veronica Mars, the mother of main character Logan Echolls is believed to have committed suicide by jumping (although a body is never found) in the episode "Clash of the Tritons".
Bridge lighting
In April 2008, the Port released an international call for artists seeking qualifications of artist-led teams interested in developing environmentally-friendly lighting concept proposals for the bridge. In 2010, a London-based design group led by Peter Fink was chosen. The winning concept envisages illuminating the bridge with programmable LED lighting in an energy neutral manner using electricity generated by wind turbines. In 2012, two long years after choosing Fink's project, the Port finally cut a check for $75,000 to initiate fundraising in concert with the San Diego Foundation. The Port of San Diego says no taxpayer dollars will be used. Instead, they are relying on grants and private donations to fund this lighting project, which will ideally be complete by 2019 to coincide with the bridge's 50th anniversary. As of March 2014, the working target date is 2019.
March, 2016 Coronado San Diego Bridge Collaborative for Suicide Prevention begins #lLivesBeforeLights social media campaign opposing project..[ ]
November 2017: Coronado City Council refuses to endorse San Diego Port Commissions bridge lighting project; siting priority misalignment; suicide prevention before aesthetics. [ ]
Urban legend
A decades-old local urban legend claims the center span of the bridge was engineered to float in the event of collapse, allowing Naval ships to push the debris and clear the bay. The myth may have developed as a result of the hollow box design of the 1,880-foot center span, combined with the low-profile barges that made it appear to float on its own during construction. However, Caltrans and the bridge's principal architect, Robert Mosher, maintain that the legend is false.
Selected photos
References
External links
- Caltrans - Bridge History and Facts
- Caltrans - Bridge Contracts
- California Department of Transportation - The San Diego-Coronado Bridge
- City of Coronado - Transportation Management Association Bridge
Source of the article : Wikipedia
0 Comments