Officials at the Springer Wildfire said conditions still exist for it to suddenly intensify, and fire crews were reminded of that on Thursday.
Greg Heule, fire team spokesman, said a measurement known as an Energy Release Component shows that the 1,100-acre Springer fire is burning nearly as hot as the 140,000 Hayman Wildfire did in 2002, when it became the largest in Colorado history.
However, Heule said the comparison is relative because the Springer is smaller and has not burned for a month as the Hayman did. With continued dry, windy weather, he said conditions remain favorable for the Springer to suddenly intensify, or "take off" -- even with more than a third of the fire contained.
"Inside the fire there's still a lot of fuel," said Heule. "The concern we have is that could toss an ember across the fire line. That's why we're careful about calling any portion of the line contained."
That possibility is why some fire crews spent a second day at Camp Alexander, a Boy Scouts facility evacuated when the fire ignited on Sunday.
The camp is a mile from the fire line, and Heule said normally the camp might not warrant structure protections. But with conditions still extreme, crews placed hoses and a water supply at the camp to protect buildings there if needed.
Heule said the fire has yet to directly threaten any homes or structures.
Despite the continuing fire danger, the overall situation has improved enough that authorities lifted evacuation orders for two subdivisions, Beaver Valley Ranch and Beaver Valley Estates.