As the search for a missing hiker with dementia moved into its sixth day on Tuesday, the San Mateo County Sheriff’s Office said the multi-agency operation will transition into a “limited continuous search” phase at sundown.  

Margaret “Elaine” McKinley became separated from her family last Thursday during a hike at the Windy Hill Open Space Preserve along the Lost Trail.  

On Tuesday evening at sunset, the search will move into a limited continuous search phase, in accordance with search and rescue best practices, the Sheriff’s Office said.  

“This phase refers to a search operation that continues indefinitely or until the missing person is located, but with resources that are scaled down compared to the initial, more intense phase,” said the Sheriff’s Office.   

Multiple agencies have joined in to help try to find McKinley, including 500 specialized search and rescue volunteers. Residents and visitors to the area have been asked to provide any photos or footage that may prove helpful and sheriff’s departments from neighboring counties have also provided resources. Despite all these efforts, there has still been no confirmed sightings of McKinley.  

On Tuesday morning, more than 80 search and rescue personnel from eight California counties joined in on the continuing operation, which has been using drones, horses, K-9s, off-road motorcycles and bicycles, planes and specialized mapping software, the Sheriff’s Office said.  

Horses, drones, and multiple other tools are being employed to try and locate a woman with dementia who got lost while hiking on Thursday, May 1, 2025. Authorities from four counties — San Mateo, Marin, Santa Clara and Alameda — continued the four-day search Elaine McKinley who got away from her family at the Windy Hill Open Space Preserve in San Mateo County. (San Mateo County Sheriff’s Office footage via Bay City News)

“Officials have reviewed more than 25 cameras on trails, private and public property,” said the Sheriff’s Office Tuesday afternoon. “More than a dozen community members have responded to the Sheriff’s Office request to review doorbell and security footage.” 

Residents are asked to continue sharing information through this link

Anyone with sightings or information about Elaine’s whereabouts is asked to call 911. 

Katy St. Clair got her start in journalism by working in the classifieds department at the East Bay Express during the height of alt weeklies, then sweet talked her way into becoming staff writer, submissions editor, and music editor. She has been a columnist in the East Bay Express, SF Weekly, and the San Francisco Examiner. Starting in 2015, she begrudgingly scaled the inverted pyramid at dailies such as the Vallejo Times-Herald, The Vacaville Reporter, and the Daily Republic. She has her own independent news site and blog that covers the delightfully dysfunctional town of Vallejo, California, where she also collaborates with the investigative team at Open Vallejo. A passionate advocate for people with developmental disabilities, she serves on both the Board of the Arc of Solano and the Arc of California. She lives in Vallejo.