From The Denver Post (Kieran Nicholson):
The Waterton fire grew to about 6 acres Thursday night at dusk, according to the Douglas County Sheriff’s Office.
The fire is burning through a watershed that supplies 80 percent of the drinking water to Denver residents, according to a Pike National Forest news release.
Firefighting crews were on scene Thursday evening, and a helicopter was making water drops on the fire, the sheriff’s office said…
The fire is zero percent contained.
The cause of the fire is under investigation. There was a storm, however, in the area about noon, when the fire broke out.
Smoke jumpers from Pocatello, Idaho, were on scene Thursday and air tankers, helicopters, hand crews and additional resources were on order.
Denver Water officials were also on scene Thursday. Officials hope to have the popular canyon open for the holiday weekend, further details on accessibility will be released Friday afternoon.