M-59 is slated to close overnight between Telegraph and Woodward in Pontiac as crews raze a pedestrian bridge, transportation officials said.

The work was ordered after a maintenance worker noticed extensive damage to the span’s bottom support beam Thursday, said Diane Cross, Michigan Department of Transportation spokeswoman.

The department had not received any reports about an accident.

“It looks like it had to be a very big vehicle to damage this structure,” Cross said. “We don’t know when it happened or what hit it — if it was 10 minutes before or late last night.”

MDOT determined the crossing should be removed to prevent problems if it were struck again, Cross said. “You don’t want a secondary hit of any type for it to become an issue.”

A crew has started posting portable message signs warning drivers about the closure, which was expected to start by 8:30 p.m. Thursday and affects all eastbound and westbound lanes.

Pontiac is paying for the repair work since the city owns the bridge, Cross said.

It is not known when the road will reopen. “Unknown ETA for reopening M59,” the agency tweeted.

“We’re hoping everything goes well and it’s just a few hours and it’s open before rush hour tomorrow,” Cross said.

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