← Evidence Library

Museum or archive

I-35W Bridge Collapse

Minnesota Historical Society

Where this source supports the record

Each entry separates the article’s editorial relevance note from its exact, section-level claims. A bibliography link without a direct claim is labeled plainly.

  1. Engineering failures · 1 August 2007

    The I-35W Mississippi River Bridge Collapse

    I-35W bridge collapse and memorial site · United States

    Open article references →
    Why editors use it here

    Oral histories, photographs, artifacts, victims, rescue, and memorial record.

    1. Quick read

      During evening rush hour on 1 August 2007, the Interstate 35W bridge over the Mississippi River in Minneapolis collapsed.

      Reviewed 26 July 2026
    2. Trigger and conditions

      At 6:05 p.m., gusset plates at a central truss connection bowed and fractured.

      Reviewed 26 July 2026
    3. Uncertainty

      NTSB established the primary cause as undersized gusset plates, with added loads contributing.

      Reviewed 26 July 2026
    4. Why it matters

      The bridge was inspected regularly, yet the fatal defect was a design calculation hidden in plain sight.

      Reviewed 26 July 2026