Jefferson County officials say U.S. 6 has reopened after it had been closed due to a 25-acre wildfire.

GOLDEN, Colo. — A wildfire dubbed the Bald Mountain Fire is continuing to burn west of Golden, according to the tweet from the Jefferson County Sheriff's Office (JCSO).

The Jefferson County Sheriff's Office said Saturday morning that the fire is about 50% contained and is now down to 17 acres. The fire did not grow overnight.

Fire crews will stay at the fire line overnight and continue to battle it Sunday, according to sheriff officials.

The fire was first reported around 2:40 p.m. Friday, a spokesperson for JCSO said. It's burning about one mile east of tunnel 2 on U.S. 6 west of Golden.

Pre-evacuations were sent to some neighborhoods last night, but no official evacuation order was sent out, the sheriff's office said.

Jefferson County Open Space said Clear Creek Canyon Park, and Beaver Brook and Lookout Mountain trails, were closed and would be evaluated before they were reopened. The parking lot at Windy Saddle also was closed.

U.S. 6 is now open between CO 119 and CO 93 following closures due to the fire activity.

Authorities have not determined the cause of the fire and are still working to figure out where the fire started.

No injuries were reported, and an investigation is ongoing.