A structure fire reported early Thursday morning heavily damaged a Medford home in the 4000 block of Griffin Creek Road, Medford Fire and Rescue officials said.

A structure fire reported early Thursday morning heavily damaged a Medford home in the 4000 block of Griffin Creek Road, Medford Fire and Rescue officials said.

Firefighters responded to a report of a structure fire at about 2:30 a.m. after the home's only occupant was awakened by her smoke detector. She and her dog made it outside without injury.

The woman, whose name and age were not disclosed, ran to a neighbor's home to call 9-1-1.

Medford firefighters responded with four engines, two water tenders and 17 firefighters. They were on scene by 2:42 a.m., said Battalion Chief Brian Fish.

"By the time we got there, it was pretty much involved," Fish said.

Firefighters spent about 30 minutes extinguishing the blaze on the two-story home. They had to attack it from the outside of the structure because of the fire's size and intensity.

The fire caused significant damage to all floors in the home and some parts of the exterior.

Fire officials were planning to return to the scene to investigate and confirm the fire's cause but believe it started on the ground floor.

The woman was taken to a local hospital for precautionary reasons, but was otherwise unhurt.

Fish said the working smoke detector prevented a potential death. Several recent fires in the Rogue Valley have not set off smoke detectors because of dead batteries.

"This is just a really good example of a case where it (worked)," Fish said.