Rainfall runoff has caused flooding west of the city, closing several roads between roughly Highway 286 on up to Avra Valley off Marstellar Road, authorities said.
The roads were closed after an overflow of water from Brawley Wash, said Deputy Jesus Bañuelos, a Pima County Sheriff's Department spokesman.
Up to 3 1/2 inches of rain fell Monday night near the Baboquivari Mountains off Highway 286, said Chris Rasmussen, a meteorologist with the National Weather Service.
"All that water flowed into Altar Wash, which converts into Brawley Wash south of Three Points," Rasmussen said. "About 7 feet of water spilled out into and open channel and affected the rural areas Tuesday morning and afternoon," he said.
Flooding occurred in the Three Points area, and areas on South Marstellar Road between West Snyder Hill Road to West Donaldson Ranch Road, said Bañuelos.
The area is west of South Sandario Road near Highway 286 on north toward Avra Valley.
Families in about 10 mobile homes in the area were affected by the flooding and have received assistance from the Southern Arizona Chapter of the American Red Cross, said Mike Sagara, a Red Cross spokesman.
If motorists or residents of these areas have questions, call the sheriff's department at 351-4900. Residents who feel they are in danger because of the flooding are asked to call 911 immediately.
The sheriff's department, along with assistance from the Red Cross has set up a command post at South Sandario Road and West Snyder Hill Road.
Motorists who need information about getting home Tuesday evening can go to the command post for information, Bañuelos said.
Information can also be found on the sheriff's department roads condition hotline at 547-7510.