Putting out the blaze that destroyed this barn was particularly challenging because there were no hydrants in the area, said Pete Piringer, spokesman for the Montgomery County Fire and Rescue Service. ( Pete Piringer /Montgomery County Fire and Rescue Service)

Fire destroyed a historic 15,000-square-foot livestock barn Sunday on a farm in upper Montgomery County. One firefighter suffered a minor burn, and about two dozen pigs died in the blaze, according to the county fire and rescue service.

The flames were reported about 3 p.m. at Spring Valley Farm in the 18200 block of Darnestown Road in the Poolesville/Dickerson area.

The cause was not immediately known, said fire and rescue spokesman Pete Piringer. Damage precluded an immediate investigation.

The fire occurred in an area without hydrants, Piringer said. Firefighters drew water from a pond, but when power lines fell, access was impaired, Piringer said. Water was supplied by tanker trucks.

Maryland state historical records indicated that the barn was built before 1909. According to the records, the farm was home about 60 years ago to 2,200 head of Hereford cattle, a particularly large herd.

Built with timbers, the barn measured 100 by 150 feet and was about 30 feet high, Piringer said. Historical documentation called it “an especially fine” example of its era.

At least two other structures were affected and damage could be as much as $500,000, Piringer said.

Many of the pigs appeared to be relatively young, he said.