LAKE GEORGE, Colo. -- Mop-up work is continuing at the Hayman Fire southwest of Denver -- even as crews braced for the possibility of heavy rains that could lead to flooding.

Storm clouds rumbled over some of the Hayman burn area Wednesday, but only about two-tenths of an inch of afternoon rain fell -- an amount that appeared to be just about right.

Fire Information Officer Russell Hubright said the slight drizzle helped because it cooled a few spots without a big deluge.

"As the monsoon season approaches, thousands of acres within the burn area have been stripped of the ground cover and vegetation that prevents sheet runoff and soil erosion on the steep slopes found in the burn area," said Erin Albury of the Hayman Recovery Assistance Center. "In addition, soil within the burn can be altered by the intense heat of the wildfire and become somewhat impermeable to rains that fall after a wildfire event."

Fire experts advised residents living on slopes and in natural drainage within the wildfire area to take precautions to avoid additional losses as a result of flash flood events.

Homeowners were advised to keep important papers in a waterproof and fireproof safety box.

Officials even said some evacuations may be necessary in flood-prone areas, 7NEWS reported.

The Hayman Fire has burned 137,760 acres and destroyed 133 homes.

It was 100 percent contained Tuesday at 6 p.m. but officials said that does not mean it's completely out. Residents may see smoke and fire as unburned islands of fuel continue to burnout within the fire perimeter. Firefighters, along with air support, will continue monitoring the fire area.