Colorado authorities are calling the wildfire that forced more than 3,500 people to evacuate their homes, the most destructive in the Centennial State's history.

Four people have been reported missing in the 11-square-mile blaze. The fire has destroyed 135 structures so far, and at least 1,000 homes are still threatened.

Some residents have been forced to fight the fire themselves to protect their homes. However, the fast-moving flames were too quick for some.

One couple escaped just in time.

"It was windy -- took off came up and over the ridge took out the house on top of the ridge," said Tom Leurer, who's home was destroyed. "Took out the house next to it..our house was third to go."

Gov. Bill Ritter, who declared a state of emergency on Tuesday, told residents to be patient and not try to get back into the area until firefighters tell them it's safe.

"It's important right now for people who have been evacuated to just be patient. This is a very volatile situation," the governor said after touring the area. His disaster declaration released $5 million to fight the blaze."

Fire officials said the fire is not spreading, due to the efforts of more than 300 firefighters on the ground - nine of whom have lost their homes to the blaze. So far, the flames are only 10 percent contained.

No injuries have been reported since the fire sparked on Monday. Officials are still investigating the cause.