The bridge, on East 800 Road west of Lawrence, could be closed up to six weeks, depending on how soon KTA is able to find a replacement for a beam on the underside of the bridge, Chief Engineer Tom Wurdeman said.
Repair costs are still being determined and the KTA will pay them, Wurdeman said.
Although the incident is still under investigation, the KTA believes it knows who is responsible for the damage, Wurdeman said.
The damage was discovered by a KTA employee, Wurdeman said.
"He saw part of a piece of backhoe equipment off in the ditch," Wurdeman said. "We notified Douglas County as soon as we found out."
The transport truck believed responsible was eastbound, Wurdeman said. It got on the turnpike at Topeka about 12:30 p.m. and was directed to pull over because it was determined to be overheight, he said. The driver, however, drove off before a trooper from the Kansas Turnpike Patrol arrived to investigate, Wurdeman said.
-- Staff writer Mike Belt can be reached at 832-7165.