Gerald Desmond Bridge

The Gerald Desmond Bridge is a cable-stayed bridge that carries six lanes of Interstate 710 in Long Beach, California, west across the Back Channel to Terminal Island. The bridge is named after Gerald Desmond, a prominent civic leader and a former city attorney for the City of Long Beach, and replaces an earlier bridge completed in 1968 with the same namesake.

The 1968 steel arch bridge developed numerous issues and the Port of Long Beach suggested it would be more economical to replace the bridge. After several years of studies, a cable-stayed bridge with 205 feet (62 m) of vertical clearance to be built north of the existing bridge was identified as the preferred alternative in the final environmental impact report (2010 FEIR). The new bridge will allow access to the port for the tallest container ships, and will be the first long-span cable-stayed bridge in California, and the first and only cable-stayed bridge in the Los Angeles metropolitan area. For the bridge to be so tall, long approaches will be required to allow trucks to cross. A joint venture of Parsons Transportation Group and HNTB performed preliminary engineering for the main span and the approaches. Earlier reports had studied and discarded various alternatives, including an alternative alignment with a new bridge south of the existing bridge, rehabilitation of the existing bridge, and a tunnel instead of an elevated bridge.

Design

The 1968 roadway was four lanes (two in each direction) with a fifth climbing lane on each end. The replacement bridge carries a six-lane roadway with emergency lanes on each side, and the grade has been decreased by building a longer approach, despite the higher vertical clearance over the Back Channel; the planned improvements brought the bridge up to current freeway standards. The replacement bridge will also carry a pedestrian/bike path and observation decks over the water along the south side of the bridge. The path is named for Mark Bixby, a longtime proponent of adding bike lanes to the new Gerald Desmond Bridge replacement and a descendant of one of the original founders of Long Beach. Mark Bixby died in a March 2011 plane crash at the Long Beach Airport.

Ocean Boulevard, which was carried by the 1968 bridge, was operated by the City of Long Beach. Ever since the replacement bridge was open to traffic on October 5, 2020, the roadway it carries was redesignated as the western extension of I-710, extending to its intersection with State Route 47, and became the responsibility of Caltrans, District 7.

From west to east, the new bridge spans a total of 8,800 feet (2,700 m), consisting of:

• The 2,800 ft (850 m) West Approach (3,117 ft (950 m) in the 2010 FEIR)
• The 2,000 ft (610 m) cable-stayed span, with a 1,000 ft (300 m) Main Span flanked by two 500 ft (150 m) Back Spans
• The 3,600 ft (1,100 m) East Approach (3,035 ft (925 m) in the 2010 FEIR)

By extending the approach structures, approach grades are reduced to no more than 5 percent.

As the tallest structure in the area, the 2020 cable-stayed bridge is a prominent addition to the Long Beach skyline.

Construction

The replacement bridge was unanimously approved by the City of Long Beach in late September 2010. A project launch meeting was held at the Port of Long Beach on November 22, 2010, attended by Long Beach Mayor Bob Foster, U.S. Representatives Dana Rohrabacher and Laura Richardson, Senator Alan Lowenthal and Caltrans Director Cindy McKim.

Caltrans, Port of Long Beach, and Metro officials reviewed seven potential engineering and construction firms, selecting four as qualified final lead bidders:

• Dragados USA (leading a joint venture of CC Myers, Dragados USA, Figg Bridge Engineers and Jacobs Engineering Group)
• Kiewit Infrastructure West (leading a joint venture of Kiewit and T.Y. Lin International)
• Shimmick Construction Company (leading a joint venture of Shimmick, FCC Construction/Impreglio and Arup/Biggs Cardosa)
• Skanska (leading a joint venture of Skanska/Trayor/Massman, Buckland & Taylor, and CH2M HILL Engineers)

Three of the pre-qualified bidders submitted proposals by March 2012, with Kiewit dropping out at the bid stage. In May 2012, the Long Beach Board of Harbor Commissioners approved Port of Long Beach staff’s recommendation that the “best value” design-build proposal to replace the Gerald Desmond Bridge was submitted by the SFI joint venture team, comprising Shimmick Construction Company Inc., FCC Construction S.A. and Impregilo S.p.A., and the contract was awarded to the SFI JV in July 2012. Major participants in the joint venture also include Arup North America Ltd. and Biggs Cardosa Associates Inc.

The project has been completed as a design-build in contrast to the traditional design-bid-build used typically in infrastructure improvement.

During the groundbreaking ceremony on January 8, 2013, two helicopters hovered 515 feet (157 m) above ground level, illustrating the height of the two cable towers for the planned replacement bridge.

The project was originally estimated to cost $800 million in 2008. By 2010, costs had increased to $1.1 billion, and funding identified in 2010 for the replacement bridge included $500 million contributed by Caltrans, $300 million contributed by the USDOT, $114 million from the Port of Long Beach, and $28 million from Metro. As of 2016, the project estimate was $1.5 billion.

Construction issues

The new bridge was delayed shortly after breaking ground. The new piers were delayed by the relocation and/or removal of numerous old and active oil wells and utility lines, which prevented foundation work from beginning. The bridge is located in the midst of the Wilmington Oil Field, one of the most prolific oil-producing fields located in the United States.

Another part of the cost increase and schedule delay is attributed to a 2013 redesign of the support towers. Caltrans and the Port of Long Beach required the tower redesign, executed by the SFI joint venture, allegedly to ensure seismic safety and to preserve long term structural integrity. The redesign set the estimated completion of the bridge back by 12 to 18 months. Other cost increases are attributed to extra oversight required by innovative, yet contractually compliant products and materials proposed by the designers of the replacement bridge.

The roadway for the approach structures was supported during construction by an underlane self-launched movable scaffold system (MSS), and is the first project in California to use a MSS. The MSS was designed to bridge the 235 ft (72 m) span between piers and to support the concrete as it was poured for each span. Once the concrete had cured, the MSS moved to the next pier and repeated the pour. The orange MSS was used on the western (Terminal Island) approach, and a similar blue MSS was used on the eastern approach.

Construction progress

By October 2014, work had started on the pilings which would serve as foundations for the new bridge's piers. The two cable-stay support towers were started in March (eastern tower) and April 2015 (western tower). Approach spans were underway by April 2016. By August 2016, the project had passed the halfway mark, and the two cable support towers were already more than 200 ft (61 m) high. On December 5, 2017, a "topping-out" ceremony was held to celebrate the completion of the two cable support towers. A virtual opening ceremony was held on October 2, 2020. Traffic opened in both directions on October 5, 2020.

Text imported from Wikipedia article "Gerald Desmond Bridge (2020-present)" and modified on 13 November 2020 according to the CC-BY-SA 3.0 license.