Crews fighting one of Colorado’s largest wildfires in history are improving containment levels Sunday.

As of Sunday morning, the Lee fire, which has charred 137,453 acres in Rio Blanco County, is 42% contained, according to the Rocky Mountain Incident Management Team.

The Elk fire, which burned 14,518 acres, is fully contained as of Sunday morning, fire officials reported.

Several evacuation zones were downgraded on Sunday. Those in the area can check U.S. Forest Service maps on where fires are impacting most.

On Saturday morning, emergency crews reopened Colorado Highway 13 south of Meeker after reaching 31% containment.

The lightning-caused Lee fire ballooned from 700 acres over two weeks.

As the fifth-largest wildfire in state history, the Lee fire prompted crews to close Highway 13 between the Western Slope towns of Meeker and Rifle until Saturday morning as they worked to solidify the corridor.

In one instance, the fire jumped the highway less than half a mile south of Meeker, prompting crews to use emergency direct measures to prevent it from getting to the town.

In total, 1,155 crewmembers responded to both the Lee and Elk fires. That includes the assistance from six aircraft, 25 hand crews, and 78 engines.

“Islands of unburned fuel remain active near County Road 5 on the south side of the fire, with heat and isolated torching. Firefighters will continue to mop up to remove heat and strengthen fire lines,” officials said in a Lee/Elk fire update on a Facebook post Sunday morning.

On Sunday morning, the Lee fire is approaching the state’s fourth largest fire — the 2002 Hayman fire — which had charred 137,760 acres, destroyed 132 homes and left six people dead.

The third biggest blaze was the 2020 Pine Gulch fire at 139,007 acres; the second was the 2020 East Troublesome fire at 193,812 acres; and the largest ever in Colorado was the 2020 Cameron Peak fire at 208,913 acres.

Those impacted by nearby wildfires are asked to visit the Facebook page for updates.