RED MESA, Colo. -- A 300-acre wildfire near the Colorado-New Mexico border was about 70 percent contained Friday after cooler temperatures and calmer winds overnight helped firefighting crews.

The fire, in dry grass and pinon and juniper trees on the Ute Mountain Ute Reservation, was about 2.5 miles from the state border and about six miles southwest of Red Mesa, San Juan Public Lands spokeswoman Pamella Wilson said.

It is being called the Well 2 Fire.

The blaze, apparently started by Wednesday or Thursday, spread quickly but then stalled when it reached an area that burned last summer.

Burlington Resources Inc. shut down at least 16 of gas wells, including six within the perimeter of the fire. No structures were threatened.

Wilson said four 20-person crews were on the way. A helicopter and four single-engine air tankers were also available.

"We were just hammered for two afternoons in a row kind of west of Durango and near Cortez," Wilson said of the midweek lightning strikes.

Waterton Fire Contained

Meanwhile, closer to the Front Range, the Waterton Canyon Fire was declared fully contained at 6 p.m Friday. It charred about 70 acres and had not grown since Wednesday morning.

Forest Service crews will continue to monitor the burn area by helicopter through the weekend and address any hot spots that may be observed until the fire can be considered fully controlled.

On Friday, a six-person hand crew rappelled into an inaccessible portion of the burn area from a helicopter and continued fire-line construction and mop-up activities, focusing on the elimination of hotspots. A Type 2 helicopter also continued dropping water on hotspots and along the burn's perimeter as needed.

Containment is declared once fire officials determine that a wildfire bears no threat of spreading beyond the burned area's perimeter, though some hot spots in the burn area's interior could exist. A fire is determined to be controlled when the entire burn area is cool with no hot spots occurring.

Denver Water plans to re-open the Waterton Canyon trailhead for the Colorado Trail on Saturday morning. The trailhead was closed during fire suppression operations. Hikers who may want information concerning the re-opening of the trailhead should call (303) 972-6626 where they can receive updated information on the trail's status.

As of Thursday, the cost of suppressing the fire had reached $142,500.

The Rio Blanco Fire southeast of Pagosa is about 150 acres and is being allowed to burn for ecological reasons.

All three fires were ignited by lightning.