The Milford Flat Fire, which is sweeping across central Utah, had charred 160,000 acres by late Saturday.
93 miles of I-15 and 23 of I-70 were closed due to fire and smoke.
Two people were killed in an apparently fire-related motorcycle accident.
Dozens of people were evacuated, most from the Cove Fort area.
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Farm buildings, a cabin and power lines have been damaged or destroyed, officials say.