5 firefighters injured fighting Quarry Fire burning in Jefferson County

Five firefighters were injured on Wednesday as they fought the Quarry Fire . That fire started on Tuesday night and has burned more than 340 acres in Jefferson County.

It was zero percent contained as of Thursday afternoon. Four of the firefighters suffered heat exhaustion and one firefighter had a seizure. All of them are expected to fully recover. Three of the firefighters returned to the front lines of the Quarry Fire after they were treated and released.

"Thursday marks Denver's 9th day above 90 degrees, and we expect this heat to linger through next Wednesday," First Alert Meteorologist Joe Ruch said. "With temperatures of the magnitude being experienced across Colorado's Front Range, those working outdoors should try their best to take steps to avoid heat exhaustion including frequent breaks in the shade and hydration."

The fire is located near the intersection of West Deer Creek Canyon Road and Grizzly Drive. And because of the need for water from aerial teams, Colorado Parks and Wildlife has closed nearby Chatfield Reservoir in Chatfield State Park to boating.

There were about 75 firefighters battling the fire on Wednesday morning, and the terrain where the fire is burning is steep and rough. There's also a concern about firefighter safety because the burn area includes an area known for rattlesnakes.

The American Red Cross set up a shelter for evacuees at Dakota Ridge High School in Littleton.