Someone drove through the construction project at Wagner and Ann Arbor-Saline Road, causing damage and setting back the timetable, according to Lodi Township Clerk Christina Smith.
The driver left marks on new concrete that was poured.
Smith said it happened after 8 p.m., Tuesday night.
A Washtenaw County Road Commission project is adding a center-left-turn lane, a traffic signal and drainage improvements as the road is reconstructed.
The project began March 23 and was expected to take three months.
Michele Ford, project manager for the Washtenaw County Road Commission, said she is determining the most efficient way to move forward. Once that's done, the concrete will be removed and new concrete will be poured.
"Any time you pull out concrete and pour concrete, there is a time element involved," Ford said.
Additional costs will be covered by the contractor, Ford said.
The Washtenaw County Sheriff's Office is investigating. Derrick Jackson, spokesperson for the WSCO, said police want to identify the person responsible for the damage.
He said tire impressions indicate the suspect was driving an all-terrain vehicle that was pulling a trailer.
He asked anyone with relevant information to contact the Washtenaw County Sheriff's Office at 734-994-2911.