The night of the collapse was the second night of the demolition, the report says. The structure had already been stripped of its concrete bed earlier in the day and deconstruction crews were stripping the bridge down piece by piece at the time of the collapse. The demolition was supposed to take two weeks.
According to the report, the crews at the south end of the bridge were pulling a girder out of the structure when it got hung up on an anchor on a middle pier. The pier gave out and collapsed. There were no injuries and the fallen portion of the bridge was found lying across a street below and railroad tracks. There was also no apparent damage to the area where the bridge landed.
Police Chief Terry Wilson said in the report that a 300-ton crane was recently delivered to the project site and will most likely be used to clean up the debris. Crews said in the report that they have the fallen piece in a stable position and are working to clear the site.
The Colorado Department of Transportation said in the report that the incident was not planned and girders did not fall into the Colorado River or out of the project site.
The new bridge is planned to cost $126 million and, the report says, a wider and longer structure that is the Colorado Western Slope’s largest infrastructure project in a generation.
Watch a video of the bridge collapsing below: