03-05-2015

Parsons Receives Engineering Excellence Grand Award from ACEC Missouri for Hurricane Deck Bridge

PASADENA, CA (March 5, 2015) – Parsons is pleased to announce that it has earned an Engineering Excellence Grand Award from the American Council of Engineering Companies (ACEC), Missouri chapter, for its design work on the historic Hurricane Deck Bridge in Camden County, MO. This award recognizes engineering firms for their design excellence and achievements in meeting the needs of clients and the public.

“Parsons is honored to be recognized by ACEC Missouri,” said Todd Wager, Parsons Group President. “We are proud to have contributed to the safety and quality of life for Missouri residents through yet another outstanding project.”

The Missouri Department of Transportation’s (MoDOT’s) Hurricane Deck Bridge opened to traffic on September 9, 2013. The $32.3 million bridge carries Missouri Route 5 over the Osage Arm of the Lake of the Ozarks, replacing the 78‑year‑old, 2,200‑ft‑long steel‑deck truss bridge that was functionally obsolete and structurally deficient.

Limited by significant right-of-way restrictions, rock bluff constraints in the approach roadway, and environmental concerns that included nearby Native American burial grounds, Parsons designed a bridge that was not only wider—with two 12‑ft driving lanes and 7‑ft shoulders on each side—but was also constructed with minimal disruption to the traveling public.

The project began with an alternative technical concept (ATC) process. Due to site constraints, Parsons’ baseline design included the use of state‑of‑the‑art slide‑in bridge technology in which the new bridge was built adjacent to the existing bridge and then slid 48 ft onto the rehabilitated piers. Traffic was to be maintained on the existing bridge while the new bridge was built. This process eliminated the need for a 42‑mi detour that would typically be required for a more traditional bridge replacement where the old bridge is demolished and a new bridge is built in its place. Bridge traffic closure was reduced to an off-season weekend.

With MoDOT’s required accelerated open date for the new bridge, Parsons and American Bridge Company successfully designed and built the bridge in 3 months less time than mandated. Demolition of the old Hurricane Deck Bridge was accomplished in three stages, between December 7, 2013, and January 30, 2014.

Parsons (NYSE: PSN) is a leading provider of technology-driven solutions focused on the defense, intelligence, and critical infrastructure markets. Celebrating 75 years of operations, Parsons provides technical design and engineering services and software products to address our customers' challenges. Parsons has differentiated capabilities in cybersecurity, intelligence, missile defense, space, connected communities, physical infrastructure, and mobility solutions. Parsons' combination of talented professionals and advanced technology enables a safer, smarter, and more interconnected world. For more about Parsons, please visit www.parsons.com, and follow us on Facebook, Twitter, LinkedIn, Instagram, and YouTube.
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