MARION COUNTY, Ore. (KOIN) — After a week of searching, crews have suspended the search for Riley Zickel, who went missing in the Mt. Jefferson wilderness area.

He was last seen on the Pacific Crest Trail north of Jefferson Park when he spoke to another hiker last Wednesday, July 27.

More than 340 searchers spent 5,000 hours over the past 7 days looking for Zickel. Teams searched hundreds of miles around the Willamette National Forest.

They decided to suspect the active search after exhausting all leads. Areas with snow and difficult terrain also contributed to the decision.

Marion County Sheriff Jason Myers said in a press release, “It is a very difficult decision to withdraw resources from this search. Our SAR teams and staff worked tirelessly to find Mr. Zickel. We’re very grateful for the assistance provided by our public safety partners, and our thoughts and prayers are with Mr. Zickel’s family.”

Search and Rescue crews from more than 10 agencies across the state have assisted in the search, using helicopters and contacting hundreds of other hikers.

The Marion County Sheriff’s Office says the search is still open until he is found.

Anyone who may have seen Zickel is asked to call 503.584.SRCH.