LAKE COUNTY, Calif. — The Lake County Sheriff’s Office is searching for a San Francisco man who has been missing since he went kayaking on Clear Lake on Sunday.

Deputies received a missing person’s report regarding Dylan Rockne Flanagan, 28, on Sunday night, said Lt. Rich Ward.

Flanagan and friends were reported to be staying at a vacation rental this week to celebrate his birthday when he decided to go out kayaking late Sunday afternoon, heading toward Rattlesnake Island, according to information a friend of Flanagan’s shared with Lake County News.

Ward said deputies responded to the report of an overdue kayaker near East State Highway 20 and Olson Road in Clearlake Oaks at 8:20 p.m. Sunday.

He said they spoke to Flanagan’s girlfriend, who said he was last seen at approximately 4:45 p.m. while kayaking on Clear Lake.

Ward said Flanagan was last seen wearing a navy-colored Hawaiian shirt, straw hat and pink shorts. He is reported to be 6 feet, 1 inch tall.

His girlfriend contacted Flanagan on his cellphone at approximately 5:06 p.m. Sunday and he advised he was on the kayak and was OK. But all of the subsequent calls went to his voicemail and no one has seen or heard from Flanagan, Ward said.

Ward said deputies contacted the Lake County Sheriff’s Office Marine Patrol Unit and requested their assistance.

Marine Patrol conducted a search of the area as well as a visual search of the shoreline along Highway 20 and the Rattlesnake Island area. Due to weather conditions and high wind, Marine Patrol ceased their search efforts until Monday morning, Ward said.

Ward said Marine Patrol continued a search of Clear Lake for Flanagan on Monday.

At approximately 9:37 a.m. Monday, Marine Patrol units located a dark green kayak in the area of Widgeon Bay, Ward said. Deputies suspected the kayak to be associated with Flanagan and took possession of the kayak for safekeeping.

Marine Patrol continued their search of Clear Lake throughout the day and utilized side-scan sonar to assist in their search efforts, Ward said.

On Tuesday, Ward said Marine Patrol units continued their search efforts and are actively searching Clear Lake for Flanagan.

The Lake County Sheriff’s Office is actively working with Flanagan’s family and friends in an effort to locate Flanagan, Ward said.

Anyone with information pertaining to Flanagan’s whereabouts is asked to contact the Central Dispatch nonemergency line at 707-263-2690.