Traffic on a northern Alberta highway is being diverted after serious damage to an overpass.

RCMP in Wood Buffalo say they have received complaints of concrete falling onto Highway 63 after an apparent hit and run incident to the overpass on Hospital Street.

Investigators say the damage is believed to have been caused by a tractor trailer hauling an oversized load that did not clear the bridge.

All traffic on the Highway is being rerouted away from the overpass due to safety concerns.

Officials say three of the four lanes on the bridge have reopened and they expect one highway lane to open by Tuesday night.

An engineer is expected to assess the damage on Wednesday afternoon.

In the meantime police are advising motorists to plan ahead.

RCMP say they believe the collision occurred between 8:30 and 9 p.m. Monday.

They are asking anyone with information about the incident to contact the detachment,  780-788-4000 or Crime Stoppers, 1-800-222-8477.