Even a Blackhawk helicopter circling the brush around the Upper Calapooia couldn’t find Mark Hardin, the Sweet Home resident who has been missing since Sunday, according to Linn County Sheriff Tim Mueller.

Hardin, 49, left Friday to do some hiking in the area and didn’t return. His wife told deputies he enjoyed visiting the area and taking photographs there.

Wednesday morning, an Oregon Army National Guard Blackhawk helicopter was scouting the search area, without result. Members of the Marion County Sheriff’s Office Special Vehicle Unit and ATV Search and Rescue Team also searched. Their focus is a 6-mile radius where Hardin’s car was found Sunday. His last known location was on a logging road called the 90-Line, located off Highway 228 about four miles from Holley.

Since Sunday, the Linn County Mounted Posse and searchers from Benton and Marion counties have joined the effort. No new clues have turned up since Monday, when searchers found a cigarette lighter his family said looked like Hardin’s. On Sunday, a plastic water bottle of the same brand left in Hardin’s cooler was found about 1,500 feet from his vehicle. The cooler, full of water bottles, was left behind in Hardin’s white 1997 Chevrolet Lumina. So was his cell phone.