Police and rescue workers spent a third straight day searching for Jeffrey Fossum on Wednesday but came up with no new leads or clues as to his whereabouts.
Fossum, 50, has been missing for more than a week. He was last seen May 24.
At 6:19 a.m. May 25, video surveillance cameras at the Mount Werner Road Sinclair gas station filmed Fossum's car, and his credit card was used to purchase gas, officials said.
Four days later, he was reported missing by a friend.
On Wednesday, Routt County Search and Rescue Incident Commander Tim O'Brien said 13 search crews from across the state, five dog teams and a helicopter participated in the search.
Crews had been searching the area in a five-mile radius of Fossum's car, which was found Sunday night at a bridge over the Elk River near Hinman Park, which is about 20 miles north of Steamboat Springs, O'Brien said.
The area already is challenging for searchers because of snow and rugged terrain. Excessive wind forced the helicopter to land at about 1:30 p.m. Wednesday, Steamboat police Capt. Joel Rae said.
About 65 searchers with the effort from other counties assisted Wednesday, including people from Larimer, Summit, Moffat, Grand and Arapahoe counties.
"We're blessed to get this kind of response from neighboring counties to help out," O'Brien said.
The searchers focused on several areas, including the Gilpin Lake, Slovania, Southfork and Box Canyon trailheads.
O'Brien said searchers are approaching the situation assuming Fossum is alive.
"As long as resources are available and the search is possible, we're going to keep searching," O'Brien said.
Fossum, a retiree, is not thought to have any camping gear with him and most likely was not prepared for anything more than a short day hike. Fossum also did not have his two dogs with him, which family and friends said was unusual. His dogs were reported at large near the Bear Claw Condominiums on Ski Trail Lane on May 24 and were taken to the Steamboat Springs Animal Shelter. Fossum lives in the 1500 block of Thistlebrook Lane.
Officials said they have no reason to suspect foul play in Fossum's disappearance.
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