A fire that erupted Friday in the Santa Ana River bottom on the west end of Jurupa Valley burned roughly five acres as crews made steady progress encircling it.
The non-injury blaze was reported about 11:10 a.m. in the area of Marlatt Street and Limonite Avenue, on the south side of the river bottom, close to the city limits of Norco, according to the Riverside County Fire Department.
According to the agency, multiple engine and hand crews from the county, city of Riverside and Corona were sent to the location and encountered flames moving at a moderate rate through thick vegetation, approaching the Hidden Valley Wildlife Area.
Cal Fire water-dropping helicopters and air tankers were called in to make runs on the brusher.
Firefighters were attempting to attack the blaze from two sides but were contending with access challenges along the river bottom, according to officials.
A battalion chief at the scene said that, as of 12:20 p.m., firefighters were closing gaps around the blaze, thanks to the air drops and minimal wind.
No homes or other structures were immediately threatened, and no evacuation orders were imminent.
Sheriff’s deputies shut down a segment of Limonite at the location for public safety.
There was no immediate word on what might caused the fire.