After doubling in size from Saturday to Sunday, the wildfire, 13 miles north of the small city of Durango, covered 20,131 acres and was just 15 percent contained, the service said.
In many ways, the favorable outcome so far is due to skilled planning by fire control experts and tireless work by a regimental-sized team of experienced firefighters, Powell said.
A wildfire burning grass and brush in central Washington threatened several dozen homes and other infrastructure, while more than 250 firefighters raced to the hills overlooking Los Angeles to battle a blaze in thick brush surrounded by large homes. "We're not out of the woods by any means but we've been very fortunate there have not been any homes burned or firefighters hurt".
"If it were not for this fire break, along with aggressive air attack and ground support, these two subdivisions most likely would have significant fire damage or be destroyed", Berino said.
The San Juan National Forest makes up some 1.8 million acres across nine counties.
Anyone caught violating the order could be found guilty of a Class B misdemeanor and face a fine of $5,000 for individuals or $10,000 for organizations, and/or imprisonment. Voos said, "we're anticipating that we're not going to get a foothold with this thing for a while here".
Fire crews are working to create dozer lines to keep the fire from reaching any structures.
Authorities ordered the residents of 675 homes to evacuate after the fire burning north of Durango almost doubled in size overnight to 26 square miles (67 square kilometers).
Residents of almost 860 homes were ordered to flee on Sunday, bringing to about 2,000 the number of dwellings placed under evacuation, said spokeswoman Megan Graham for La Plata County, Colorado.
The smoke from the wildfire has affected air quality, Graham said.
If any exemptions are granted, those users would be required to take precautions, such as carrying water, shovels and fire extinguishers and possibly only allowed in during certain times of the day, she said.
Previous evacuations include the communities of Mountain Home, Wold Tract, WyoColo, Foxpark, Gramm, Beehive, and Miller Lake.
UPDATE (3:40 p.m.) The fire is now estimated at 150 acres, according to InciWeb.
The move comes as the residents of over 2,000 homes have been forced to evacuate because of a fire that started in the forest that has burned about 31 square miles (about 80 square kilometers).
A fire in California that burned nearly 200 acres has been contained, officials said.