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The stubborn Cow Hollow Wildfire twice forced officials to revise their target for full containment, but crews managed to fully contain the blaze on Thursday.

Fire Information Manager Louis Haynes said the nearly 300-acre blaze, smoldering and flaring in the rugged, steep and remote reaches of eastern Utah's Ashley National Forest, was 100 percent hemmed in as of Thursday afternoon.

"It's been a nasty little bugger," Haynes said Thursday morning, acknowledging the latest 100 percent containment estimate of Wednesday night had failed to be realized — just as the previous one, Tuesday night, did not materialize.

"This fire just doesn't seem to want to go out," he added, while containment was still hovering around 90 percent. "We keep discovering hot spots along the perimeter."

There were 150 firefighters laboring to cut the remainder of the lines some 9 miles south of Fruitland.

The fire, sparked by lightning last Friday afternoon, caused no injuries and burned no structures.

Reporter Michael McFall contributed to this story.

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