A grass fire near the mouth of Weber Canyon forced the closure of parts of Interstate 84 Saturday afternoon.

Crews responded to the fire a little before 1 p.m., said Luke Minton, wildland division chief with the Weber Fire District. They promptly shut down I-84 eastbound at U.S. Highway 89 and westbound at Mountain Green.

The road was shut down for about 8 hours before officials opened up the inside lane in each direction just before 9 p.m.

The Broad Fire spread 30 to 40 acres within the first couple of hours, Minton said.

“The fire is still growing in size,” he said around 3:30 p.m. “No containment, no control.”

By 9 p.m., the fire had grown to about 125 acres, but it had stopped progressing on the southern edge and had slowed on the eastern and western edges.

While no structural damage has been reported, Union Pacific rail lines and Rocky Mountain Power infrastructure in the area are at risk, Minton said. No evacuations are currently in place, he said.

Extra ground and air resources have been called to the scene. Fixed-wing air tankers are spraying retardant, and helicopters are making bucket drops, Minton said.

“The terrain is steep and very difficult to access,” he said, explaining the need for air support.

This is the second major grass fire in the Weber Canyon area in less than a month.