A woman clings to a tree near Violettes Lock Road in Maryland.

A woman who was seen clinging to a tree in the water near Violettes Lock Road in upper Montgomery County was rescued after being in the water for almost an hour.

Dramatic footage of the woman in the rushing water was captured by a helicopter.

Reports say the 31-year-old woman had been hanging onto the tree for about 40 minutes before she was rescued.

Authorities rescued her by boat and she had been transported to a local hospital.

The woman was so cold she told authorities she was losing feeling in her legs.

“She was extremely grateful,” said Joe Bell, one of the firefighters who rescued her. “She didn't have much longer to hold onto the tree.”

Firefighters said the woman first tried to go kayaking on the Virginia side of the river but left because the areas were closed due to flooding.

She then drove to the Maryland side in Potomac at Riley’s Lock.

The same rescue team in Montgomery County saved an Arlington boy scout troop stranded near a campground in White's Ferry early Monday morning.