Construction of the I-35W Bridge in Minneapolis, MN

  • 14 Apr 2009
  • 11:30 AM - 12:59 PM
  • Hotel VQ


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Following the tragic collapse of the I-35W Bridge in Minneapolis in August of 2007, Flatiron formed a joint venture team to design and build the replacement bridge for the Minnesota Department of Transportation. After receiving the highest score on the proposal and subsequently winning the contract, the team mobilized quickly to begin work on the new structure. Prior to its collapse, this bridge carried more than 140,000 vehicles a day. The loss of this vital link increased commuter expenses, created a burden on surrounding roads and costs approximately $400,000 per day in lost revenue.

The new St. Anthony Falls Bridge is a 1,216-foot-long, 10-lane concrete bridge with a 504-foot-long precast segmental main span. The bridge is supported by three land-based piers (four columns at each pier) standing 70 feet tall. Segments were cast on the south bank of the river on an existing closed section of I-35. Two 450-ton capacity derricks lift the segments into place. There are 120 precast segments ranging in weight from 170 to 210 tons each. The bridge also includes a memorial for those that lost their lives when the old bridge collapsed.

The Flatiron team focused on building the best and safest bridge in all aspects of its proposal. Some of the highlights included the use of high performance concrete to provide superior durability, a state-of-the-art sensor and monitoring system built into the bridge that will allow for easier and more comprehensive monitoring and a comprehensive safety program that will be implemented throughout all aspects of the design and construction process.

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