BATH — The two people in a vehicle that broke through a guardrail and drove off the Route 1 viaduct Monday afternoon were in fair condition Tuesday at Maine Medical Center in Portland, Police Chief Mike Field said Wednesday.

The only occupant of the vehicle on which the car landed was uninjured.

Melissa Medina, 37, of Windham – driver of a 2003 Mercury Montana traveling south on the viaduct just after 2:30 p.m. – lost control of her vehicle, possibly due to snowy conditions, according to Field. The car broke through about 50 feet of guardrail and fell toward the street below.

It landed on its roof in the bed of a Ford F-150 driven by Roy Ordway, 60, of Bath, who was heading south on Leeman Highway Extension.

Medina was accompanied by her 12-year-old son; both of them had non-life-threatening injuries at the time of the accident.

Police say black ice may have caused Medina’s vehicle to go into a skid and send her off the viaduct. The viaduct, closed Monday afternoon until about 5 p.m., was repaired Tuesday night, Field said.

He said it had been at least 20 years since he had seen a similar accident occur.

The viaduct, which carries Route 1 traffic over the heart of the city, will close later this year for reconstruction. Preliminary work is to begin this spring on Washington Street intersections, frontage roads and drainage, according to Maine Department of Transportation project manager Joel Kittredge.

The viaduct will remain open until Oct. 11, and must reopen no later than Memorial Day 2017. There are incentives for early completion and penalties for running late.

All work is to be completed by June 30, 2017.

“The superstructure … is going to be torn down, right down to the ground,” Kittredge said in January. “And then it will be rebuilt.”

Alex Lear can be reached at 781-3661 ext. 113 or alear@theforecaster.net. Follow him on Twitter: @learics.