Mark Joseph Hardin, 49, has been missing from Sweet Home, Ore. since August 5, 2011. Mark may have gone on a hike in the Upper Calapooia area. Authorities found his Chevy Lumina on Saturday afternoon near the 100 line gate on the Upper Calapooia Road.

The Linn County deputies checked the area but did not locate Mark on Saturday. A SAR group and more Sheriff’s combed the area on Sunday and Monday, but they still did not locate Mark. 100 searchers spent over 2,000 hours looking for Hardin – including an Oregon National Guard helicopter crew, teams with cadaver dogs and ATVs, as well as posses on horseback.

A lighter and water bottle were found alongside the road near Mark’s vehicle that is believed to have belonged to him. The only other clue they found was he was seen near the road late Sunday morning by a pair of transients camping about two miles east of where his vehicle was found.

Mark’s cell phone messages went straight to voice mail and there were no recent calls or text messages from his phone.

Anyone with information about Hardin’s location is asked to call the Linn County Sheriff’s Office at (541) 967-3950.