The main span of the bridge was lifted from its temporary supports, rotated 90 degrees across several lanes of traffic and lowered into position on Saturday, according to The FIU News.
The bridge had a span of about 174 feet over Southwest Eighth Street, a major thoroughfare that crosses the county, connecting the F.I.U. campus in western Miami-Dade County with the city of Sweetwater.
Destinée-Charisse Royal/The New York Times
It had been assembled off-site and moved to the location on Saturday. The bridge was still under construction and was not expected to open to the public until the end of the year, a university official said.
The National Transportation Safety Board said that it would investigate the collapse. Munilla Construction Management, which was building the bridge, promised in a statement that it would investigate what went wrong and would cooperate with any other inquiry. The engineering firm for the project, FIGG Bridge Engineers, said that it would also cooperate with investigators.
“Barring somebody using it that wasn’t supposed to be there, it’s either an engineering problem or it’s a construction problem, but that’s why you bring in the professionals,” Mr. Nelson told CBS Miami, noting that the deaths had come tragically soon after 17 people were shot at a high school in Parkland.
He said he had spoken to the university president, Mark B. Rosenberg, soon after the collapse, and “you can imagine the near shock that he was almost in.”