A new incident team is preparing to take over management of the Aspen Acres fire as the seventh-largest wildland blaze in Colorado history approaches 102,000 acres.

Rocky Mountain Complex Incident Management Team 3 will assume operational command of the blaze at 6 a.m. Tuesday, relieving Northern Rockies CIMT 6, officials said Monday.

“The Rocky Mountain Team brings the same capacity and expertise to incident management as the Northern Rockies Team,” officials said in an online update.

The wildfire, burning in Pueblo and Custer counties, had scorched 101,921 acres as of Monday morning. Firefighting crews took advantage of minimal weekend fire activity to bolster established lines and establish new ones, increasing containment to 66%.

With thunderstorms expected Monday evening, incident officials expressed continued concern about flash flooding along the burn scar.

“Heavy rain can produce flash flooding and debris flows with little warning,” officials said.

On Sunday in Custer County, more than 85 volunteers helped fill and load sandbags to help protect residences against flooding.

“Homeowners are encouraged to pick them up in San Isabel and Aspen Acres in order to place them around their property,” incident officials said.

All evacuations have been downgraded to pre-evacuation or “clear.” Residents in pre-evacuation status are encouraged to stay prepared in case a sudden increase in fire activity forces them to leave again on short notice.