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Hood Canal Bridge Demolition


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Project comprised of the demolition of 22 Tons concrete decking with trucks standing by for transport to reclamation sites throughout the Seattle area.

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Hood Canal Bridge Demolition

  1. 1. East-half Replacement and West-half Retrofit ProjectTotal Project Budget: $471 millionContractor: Kiewit – GeneralProject Scope: • Replace the east-half floating portion of the bridge • Replace the east and west approach spans • Replace the east and west transition spans • Widen the west-half to allow for continuous eight-foot shoulders across the entire length of the bridge - matching the new east-half • Upgrade electrical systems on the west-halfProject Demolition:Pontoons R, S and T, left Port Gamble Bay on the Kitsap Peninsula at 8 a.m. Monday morning and were moored at Seattle’sTerminal 91 at 8 a.m.Tuesday morning. The pontoons traveled at a maximum speed of 2 knots, or about 2.3 mph from Port Gambleinto Elliot Bay to Magnolia Bluff where they were moored at Terminal 91 in Seattle. The replacement pontoons were originally built in the 1980’s • Total Length of R, S, T: 3 Football fields  Pontoon R: 360 feet long, 60 feet wide and 21 feet tall  Pontoon S: 360 feet long, 60 feet wide and 21 feet tall  Pontoon T: 180 feet long, 60 feet wide and 21 feet tall • Total draft: 12 feet; 9 feet of the pontoons are above the surface of the water. • Weight of RST: 19,000 tons, more than five times the weight of the Space Needle (which is 3,700 tons).
  2. 2. Pontoons barged toPier 91 inSeattle, carefullypositioned along theinside pier.
  3. 3. Project completed on time, within budget and with zero accidents
  4. 4. Nuprecon LP was contracted for the demolition and removal of the old roadway and superstructure diagrams, to make way forthe construction of a new, wider roadway on top of the 60-foot wide pontoons to match the height and width of the widened west-half. The refurbished pontoons will be towed back to Port Gamble this fall.During the course of the contract, Nuprecon provided equipment and manpower to demolish and remove from the site 900 lf ofsuperstructure including barriers, roadway slab, precast girders, girder stops and diaphragms located at Pier 91. Included in thiswork, Nuprecon will demolish 30 concrete columns and saw cut 900 lf of roadway deck. Girders and decking were picked withcranes and placed on flatbeds in 60’ sections and hauled through the City of Seattle to a local reclamation site.Retrofitting these pontoons helped the Hood Canal Bridge Project meet its May-June 2009 float-in date and save money andtime. If three more new pontoons had to be built, the project schedule would have increased by at least one year.The new Hood Canal Bridge east-half will be comprised of 17 pontoons: R, S and T and 14 new pontoons constructed atConcrete Technology graving dock in Tacoma. The new Hood Canal Bridge east-half will be replaced during the six-week May-June 2009 bridge closure.The Hood Canal Bridge is the longest floating bridge over saltwater in the world. WSDOT and K-G lead the world in floatingbridge technology. Learn more about this exciting, one-of-a-kind project by visiting The site includesweb cameras, media kits, animations, historical photos, fact sheets, towing information and community stories about the bridge.