A fire in the Santa Ana River bottom kept CalFire/Riverside County and Riverside city firefighters busy Sunday night but remained small, according to reports.

City limits boundaries in the river area frequently trigger response from both agencies, and Riverside city sent out a news release Sunday night before it was determined that the fires was in the Jurupa Valley area of responsibility.

The fire was reported at 10:31 p.m. in the river bottom and had to be accessed from Tequesquite Avenue and Gregory Road and burned about 1/4 acre, according to Jody Hagemann, county fire spokeswoman.

The entry point is north of Ryan Bonaminio Park.

Last week, Riverside city fire responded to another riverbottom fire Wednesday, Feb. 21, in the area of the Old Boy Scout Camp in Fairmount Park along the Dexter Bike Path, officials said.

In that fire, an aggressive attack kept the blaze at a half-acre.

On Dec. 21, a riverbottom fire scortched 50 acres. The Riverbottom fire prompted evacuations and road closures, including Mission Inn Avenue into Jurupa Valley. But the iconic Festival of Lights celebration at the Mission Inn continued as scheduled.

Fires in the riverbottom are often set by homeless people trying to stay warm, and trouble strikes when the flames get away from them.

The causes of the latest riverbottom fires have yet to be determined.