Firefighters on Sunday worked to contain the Cow Hollow Fire in Duchesne County.
The lightning-sparked fire, which started on Friday, grew from about 60 acres on Saturday to 375 acres by Sunday morning. About 5 percent of the fire at that time was contained, according to a news release.
The wildfire was burning through heavy timber in the Ashley National Forest, about 9 miles south of Fruitland.
There were 167 firefighters battling the blaze, 20 of whom were the Alta Hotshots, a brand new hotshot crew. Air tankers were on call, but the flames were in a steep canyon only accessible by foot.
The firefighters planned to keep improving the on-foot access to the fire, cut a direct line on the west flank and conduct "burn-out" operations on the east flank, according to the release.
Meanwhile, firefighters made a lot of progress containing the lightning-sparked Slope Fire in Millard County, which remained at about 600 acres Sunday. The fire was about 60 percent contained, and was mainly smoldering in grass and brush.
The latest update Sunday on the fires indicated neither was threatening any structures.
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