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The lightning-sparked Long Ridge Fire had blackened nearly 1,000 acres of cheatgrass, sage and juniper in Utah's west desert as of Wednesday.

There was no estimate for containment of the fire, burning since Sunday about 6 miles west of the tiny town of Mona. Flames continued to blacken unpopulated and remote rangelands but were not threatening structures and homes.

The Central Utah Interagency Fire Center estimated that nearly 100 firefighters were working to cut containment lines around the blaze on Wednesday, though there was no estimate for when that work would be completed.

Meanwhile, about 50 firefighters had achieved 80 percent containment of the 254-acre Kolob Terrace fire and expected to have it completely contained by Wednesday night. National Park Service spokesman David Eaker said the blaze burned grass, brush and pinyon near the Zion National Park boundary along Kolob Terrace Road and 6 miles north of Virgin.

No structures were threatened and no injuries were reported in that blaze, either, though the flames had briefly burned toward some camper trailers on Monday afternoon before being turned back.

The fire was believed human caused, but remained under investigation.

Also contained was the 420-acre, lightning-ignited Sally's Hollow fire, 5 miles north of eastern Utah's Buckeye Reservoir.

Firefighters were monitoring, but not aggressively battling, the remote 500-acre Spring fire in eastern Utah's the Ashley National Forest near Duchesne. It was started by lightning on July 30, with most of the scorched lands along Reservation Ridge.

Meanwhile, crews were being mobilized Wednesday to put an end to the 150-acre Woods Canyon fire, started by lightning Sunday near central Utah's Fishlake National Forest, fire information officer Wende Wilding said. It was 90 percent contained late Wednesday morning.

About 50 firefighters, aided by water-bearing helicopters and heavy equipment on the ground, were working to clear fire lines on Wednesday. There was no estimate for when the blaze would be fully contained.