A California woman in the early stages of dementia who went missing Monday in Heyburn State Park had not been found by late Thursday, officials said.

Jacquelyn D. Grinder, 69, who is also deaf and walks with a limp, was last seen around 9:30 a.m. or 10:30 a.m. Monday. She was walking north along Chatcolet Road, the Benewah County Sheriff's Office said.

She was wearing a white T-shirt and white hat and dark shorts. She is 5-feet, 11-inches tall and weighs 170 pounds, the sheriff's office said. A friend of Grinder's told KHQ News that Grinder has been traveling to the park for years for vacations.

Benewah County deputies, St. Joe Valley Search and Rescue, state park personnel and other law enforcement and fire agencies have conducted the search on the ground, on the lake and by air. Some volunteers from the public also have contributed to the search.

Anyone with information is being asked to contact the Benewah County Sheriff's Office at (208) 245-2555.

Separately, Coeur d'Alene police said a 73-year-old Coeur d'Alene woman with dementia went missing Thursday.

Shirley Perry Schmale was last seen on the 2400 block of Bolivar Avenue at 9:40 a.m. Thursday.

Schmale was driving a silver 2011 Toyota Camry with California license plates. The number is 7JIA442.

"Shirley has onset of dementia and recently had a change in her medication," said Coeur d'Alene Police Sgt. Christie Wood. "She is possibly headed to the Salem, Ore., area. Officers have reason to believe she is currently in the area of Tri-Cities, Wash."

She is described as 5-feet, 3-inches tall and 160 pounds. She has grey hair and blue eyes, and a 1-inch surgical scar on the front of her neck.

Anyone with information about Schmale's whereabouts is asked to call the Coeur d'Alene Police Department at (208) 769-2320.