The Minnesota Legislature established a Joint Committee to Investigate the Bridge Collapse on August 14, 2007, to be comprised of sixteen legislators from both the House and Senate transportation committees.
In August 2007, the Joint Legislative Committee to Investigate Bridge Collapse asked the Office of the Legislative Auditor to update their 1997 report, Highway Spending: a Program Evaluation Report. The resulting report, State Highways and Bridges, was published in February 2008.
On December 19, 2007, the Minnesota Legislature's Joint Committee announced it had authorized the spending of up to $500,000 to the law firm Gray Plant Moody for an investigation into MnDOT and the I-35W Bridge collapse. On May 21, 2008 the Joint Committee released their report, Investigative Report to Joint Committee to Investigate the I-35W Bridge Collapse.
The Committee met five times between October 3, 2007 and June 24, 2008.