UPDATED 3:30  p.m. Friday

A brush fire that burned nearly 20 acres near the Newhall Pass and snarled traffic well into evening rush hour is out, after quick action by firefighters on the ground and in the air.

A fast-moving brush fire threatened homes in the LaSalle Canyon area, but quick response by firefighters prevented any structure loss.

The fire started around 2 p.m. near the right shoulder of the northbound I-5 at Calgrove.

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The northbound I-5 was closed completely, as flames came up to the traffic lanes, but the fire has receded and two lanes have been reopened. Traffic is moving slowly through the pass, with the backup extending to the 210 junction northbound and McBean Parkway southbound.

Fire Department spokesperson Stephanie English said that nearly 20 acres burned, but that the two-alarm response from L.A. County and first-alarm response from L.A. City helped turn things around in a hurry.

“This is an annual occurrence in the Calgrove area,” she said.