At 11:24am firefighters were dispatched to a report of a brush fire near the Tigard Sand & Gravel quarry in unincorporated Washington County. On arrival, crews found approximately 3-5 acres of dry brush on fire and initiated an attack using hand lines from brush rigs.
Because of the remote location between two quarries, water had to be shuttled in using brush rigs and water tenders. Firefighters were able to extinguish the fire in approximately 50 minutes, but were later called back to the same location at 2:30pm to another report of smoke and flames. Soon after arrival, the incident commander witnessed part of an electrical transmission line fall about 12 feet from its original position over the fire area. Firefighters then created perimeter around the fire, while PGE crews assessed the power lines to ensure no personnel were at risk. Once the area was determined to be safe, firefighters quickly extinguished the remaining parts of the fire.
No injuries were reported and no structures were at-risk.
A fire investigator, in conjunction with PGE crews, determined the most probable cause to be an insulator on the power transmission line had shorted causing sparks that fell and ignited dry grass below.