After a brief evacuation late Saturday afternoon, guests at the St. Regis hotel and residents of the Deer Crest area of Deer Valley were allowed to return home.

The evacuation was a precautionary measure in response to the 750-acre brush fire that ignited at about 2:40 p.m. Saturday along US40 at the Mayflower exit. The fire also shut down the busy highway for a few hours.

As of Sunday morning, the Fox Bay condos and the Lodge at Stillwater were still under an evacuation order and Jordanelle State Park was closed as firefighters continued to fight the blaze which, as of 9 a.m.Sunday, was only 40 percent contained.

According to a press release from Wasatch County, its dispatch center originally received reports of three small fires but high winds caused the fires to merge. Firefighters from the Jordanelle Fire Station "were on scene within two minutes of the call being received," the release stated.

As of late Saturday night, other than a small electrical substation, there was no property damage and no injuries. The burn area was located on the east side of US40 straddling the Wasatch and Summit County line, but fears that the wind might shift and cause the fire to jump over the road on Saturday spurred the additional evacuations on the Deer Valley side.

Saturday evening the Red Cross established evacuation centers in Heber, at JR Smith Elementary School and at the Park City Municipal Athletic and Recreation Center (PCMARC). The PCMARC site was established in case the Deer Crest and St. Regis evacuations became mandatory. They did not and the PCMARC site has been closed.

Damage to the substation near the Jordanelle Reservoir temporarily knocked out power to about 2,000 customers in Wasatch and Summit Counties but has since been restored.

Fire crews from Wasatch County, North and South Summit and Park City, along with state, U.S. Forest Service and BLM agencies have been fighting the fire on the ground and in the air. Two helicopters and four fixed wing aircraft helped with the suppression effort on Saturday evening.

According to the Utah Interagency Fire Service website, the Jordanelle fire had grown to 750-plus acres. Wasatch County released this perimeter map of the fire perimeter on Saturday: Jordanelle fire map

There have been no official statements about the cause of the fire.