I-35W Mississippi River bridge in the context of "Saint Anthony Falls"

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⭐ Core Definition: I-35W Mississippi River bridge

The I-35W Mississippi River bridge (officially known as Bridge 9340) was an eight-lane, steel truss arch bridge that carried Interstate 35W across the Mississippi River one-half mile (875 m) downstream from the Saint Anthony Falls in Minneapolis, Minnesota, United States. The bridge opened in 1967, and was Minnesota's third busiest, carrying 140,000 vehicles daily. After 39 years in service, it experienced a catastrophic failure during the evening rush hour on August 1, 2007, killing 13 people and injuring 145. The National Transportation Safety Board (NTSB) cited a design flaw as the likely cause of the collapse, noting that an excessively thin gusset plate ripped along a line of rivets. The amount of weight on the bridge at the time of failure was also cited by the NTSB as a contributing factor.

Help came immediately from mutual aid in the seven-county Minneapolis–Saint Paul metropolitan area and emergency response personnel, charities, and volunteers. Within a few days of the collapse, the Minnesota Department of Transportation (MnDOT) planned its replacement with the I-35W Saint Anthony Falls Bridge. The construction of the replacement bridge was completed quickly, and the new bridge officially opened on September 18, 2008.

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In this Dossier

I-35W Mississippi River bridge in the context of Mill District, Minneapolis

44°58′42″N 93°15′23″W / 44.978333°N 93.256389°W / 44.978333; -93.256389

The Mill District is an redeveloped former industrial within Minneapolis, Minnesota, United States, and a part of the larger Downtown East neighborhood. The area contains several former flour mills left over from the days when Minneapolis was the flour milling capital of the world. With almost none of the mills still active, a number of these have been converted into condominiums leading to a revitalization of the neighborhood.

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I-35W Mississippi River bridge in the context of Minnesota Fringe Festival

The Minnesota Fringe Festival is a performing arts festival held in Minneapolis, Minnesota, United States, every summer, usually during the first two weeks in August. The eleven-day event, which features performing artists of many genres and disciplines, is one of many Fringe Festivals in North America. Minnesota Fringe is the largest nonjuried festival in the United States and the third-largest Fringe festival in North America. In 2013, Minnesota Fringe ran August 1–11 and featured 176 shows with a total of 895 performances in multiple venues around the city and distributed 50,007 tickets over the eleven-day event. In 2007, attendance and box office revenue were adversely affected by the collapse of the I-35W bridge the day before the festival opened.

Fringe shows are 60 minutes or less and appear in an official venue supplied by the festival for five performances stretched out over the festival's eleven days. Venues vary widely, with capacities ranging from 55 to over 400, and available configurations include black-box, proscenium, thrust or arena stages. Past venues include Minneapolis Theatre Garage, HUGE Improv Theater, Mixed Blood Theatre mainstage, Theatre de la Jeune Lune's side stage and the four stages at the University of Minnesota's Rarig Center. Normally, eleven shows will share a venue.

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I-35W Mississippi River bridge in the context of John A. Blatnik Bridge

The John A. Blatnik Bridge is the bridge that carries Interstate 535 (I-535) and U.S. Highway 53 (US 53) over the Saint Louis River, a tributary of Lake Superior, between Duluth, Minnesota, and Superior, Wisconsin. The bridge is 7,975 feet (2,431 m) long and rises up nearly 120 feet (37 m) above the water to accommodate the seaway shipping channel. It was dedicated on December 2, 1961, but was renamed for Congressman John Blatnik on September 24, 1971, to commemorate Blatnik's role in making the bridge a reality. The Blatnik Bridge replaced a swinging toll bridge around the same location that carried both automobile and rail traffic.

The bridge was widened and the substructure was strengthened between 1992 and 1993 to accommodate hard shoulders. The Blatnik Bridge was reduced to two lanes temporarily in 2008, after it was discovered in a bridge inspection that the 1990s upgrades to the Blatnik Bridge had added weight beyond the load limit for gusset plates in eight different locations. This was similar to the gusset plates that caused the I-35W Bridge in Minneapolis to collapse on August 1, 2007. The Blatnik Bridge was reduced to two lanes temporarily until the gusset plates could be strengthened.

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