By 8:30 p.m., firefighters had estimated containment of the Cloud Fire at 50%.
The U.S. Forest Service/San Bernardino National Forest tweeted "The forward rate of spread has been stopped" and "Firefighters have hose around the fire."
Fire agencies assigned 150 personnel to battle the blaze.
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The fire was first reported in the area of Waterman Canyon near Highway 18 just before 6 p.m.
Highway 18 was closed in both directions as firefighters battled the blaze.
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No injuries or property damage were reported.