A 78-year-old Mount Shasta woman with dementia was located after four hours of searching Monday evening when she failed to return home after her afternoon walk.

A 78-year-old Mount Shasta woman with dementia was located after four hours of searching Monday evening when she failed to return home after her afternoon walk.

About 40 volunteers from local fire departments and law enforcement agencies responded to find Helen Johnson, who was reported missing  from Terry Lynn Drive by her daughter at about 6 p.m. on May 7, said Mount Shasta Police Chief Parish Cross.

Johnson was found walking with her 20 pound black and white dog, Tootsie, on Interstate 5 northbound near Black Butte Summit at about 10 p.m., Cross said. Someone driving on I-5 saw Johnson and contacted the Weed Police Department, who immediately responded and confirmed the woman was Johnson.

Cross said it isn’t known how Johnson got to that location. She was wearing blue jeans, tennis shoes and a shirt, and was not dressed for the cool evening weather.

“It was a great relief to us all that she was found safely,” said Cross. Responding agencies included the Mount Shasta City Fire Department, Mount Shasta Fire Protection District, CAL?FIRE, California Highway Patrol and the Siskiyou County Sheriff’s Department.

Cross said the search began immediately since Johnson was “missing at risk,” due to her slight dementia.

An Incident Command Center was formed at the City Fire Hall, Cross said. The city was divided into four quadrants, and personnel was assigned to each area. A reverse 911 call was placed to residents in the area advising them of the search, and volunteers went door to door looking for information and tips, Cross said.

Plans to call in a CHP helicopter to assist in the search proved to be unnecessary after Johnson was found, Cross said.