On Saturday night, May 11, 2019 Cal Fire / Riverside County Fire responded to multiple reports of a fire in the Santa Ana River bottom. The fire was reported around 9:00pm in the river bottom south of Mission Inn Avenue. The first arriving engine company reported 1/4 acre burning in heavy brush at a slow rate of spread. Firefighters made a quick and aggressive fire attack and were able to contain the fire to the encampment and a make shift structure within the encampment. The cause of the fire has yet to be determined.