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St. Anthony Falls Bridge By: Timothy Brewer. St. Anthony Falls Bridge Backround. Location: Minneapolis, Minnesota Design: Steel Truss Arch Bridge I-35 W, 8 Lanes of Traffic Total Length: 1,907 feet/ Width/Height: 113.3/115 ft Beginning Date Of Construction: 1964 Completed: November 1967.

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st anthony falls bridge backround
St. Anthony Falls Bridge Backround
  • Location: Minneapolis, Minnesota
  • Design: Steel Truss Arch Bridge
  • I-35 W, 8 Lanes of Traffic
  • Total Length: 1,907 feet/ Width/Height: 113.3/115 ft
  • Beginning Date Of Construction: 1964
  • Completed: November 1967
  • Designated Bridge 9340
  • Sverdrup & Parcel designed the bridge in 1961
  • Hurcon Inc. and Industrial Construction Company were given the building contracts
  • Contracts were worth more than 5.2 million dollars at the time
  • Construction began in 1964
august 1 2007
August 1, 2007

At 6:05 p.m. CDT, the central span of the bridge suddenly gave way, thus followed by its adjoining spans.

The south part of the bridge went 81 ft eastward when it collapsed, while the northern parts landed on 3 freight cars in a ship yard.

A state of emergency for the city of Minneapolis was declared the next day, August 2nd.

Navy divers began arriving on August 5th to survey the wreckage from underneath.

victims and survivors
Victims and Survivors
  • 13 people were killed (8 males, 5 females)
  • A school bus carrying 60 children rested

against a guardrail of the collapsed structure.

  • 1 youth worker was severely injured and 10

Children had minor injuries.

  • During the first 40 hours, 11 area hospitals treated 98 victims
causes of the collapse
Causes of the Collapse

  • Thin or undersized gusset plates
  • Added weight over the years
  • Equipment on the bridge
reconstruction information
Reconstruction Information
  • Figg Bridge Engineers & Flatiron Constructors Inc. were given the new building contract
  • Cost for the new bridge was around 9 million dollars
  • 339 days to complete
  • By completing the bridge, it helped the overall traffic problem seeing as 140,000 cars on average traveled across it on any given day.
new design techniques and materials
New Design, Techniques, and Materials


  • Consists of drilled shafts
  • Four for each of the eight central span piers
  • Each has a steel casting over concrete

Pier Construction

  • Each pier will be cast on-site atop the footings on each bank.

Superstructure Construction

  • Temporary scaffolding and forms will be built to provide a mold for the parts of the bridge over land.
design techniques and materials cont
Design, Techniques, and Materials Cont.

Segment Placement

  • The center spans box girder segments are precast and will be fitted by lowering them from a crane.


  • Segments are linked together by steel cables threaded through them, with each segment linked to the adjacent ones and full-length cables linking the entire array.

Final Segment

  • After all the segments are in place, the final gap between the assembled sides is cast in concrete, completing the central span.
new i 35w bridge
New I-35W Bridge
  • 100-year life span
  • 10 lanes of traffic, five in each direction—two lanes wider than the former bridge
  • 1,223 feet long , 684 feet less than the previous.
  • 189 feet wide—the previous bridge was 113 feet wide
  • 13 foot wide right shoulders and 14 foot wide left shoulders, the previous bridge had no shoulders
  • Light Rail Transport-ready which may help accommodate future transportation needs
additional information
Additional Information
  • The completed bridge incorporates "Smart Bridge" technology to enhance bridge inspections and assist in the advancement of bridge design.
  • In a partnership between Mn/DOT, the Federal Highway Administration, and the University of Minnesota, over 320 sensors throughout the structure monitor the bridge behavior.
  • These include vibrating wire strain gages embedded in the concrete of the foundations, piers and superstructure, long gauge fiber optic strain gauges, accelerometers, linear potentiometers, and corrosion potential sensors embedded in the wearing surface.