A fire that broke out Thursday in the Santa Ana River bottom between Jurupa Valley and Riverside burned under a quarter acre before crews got it partially contained.
The non-injury blaze was reported at 10:50 a.m. in the area of the Mission Inn Avenue Bridge, just west of Crestmore Road, according to the Riverside County Fire Department.
The agency said multiple engine crews were sent to the location and encountered slow-moving flames burning in heavy vegetation on the north side of Mount Rubidoux Park.
The brusher spread into the Riverside city limits, and Riverside Fire Department crews took over the containment effort shortly after 11 a.m., according to reports from the scene.
Winds were nominal in the river bottom Thursday morning. No homes or other structures were immediately threatened.
Full containment was expected by 1 p.m.
There was no word on what might have triggered the brusher, but homeless encampments are spread throughout the dry river bottom, and cooking, warming and debris fires are common year-round.