Travis Decker's not some unstoppable rugged action hero, according to the Chelan County Sheriff ... 'cause it's the terrain -- not his military training -- that's helping him avoid capture.

Law enforcement has tracked someone they believe to be Travis Decker - accused of killing his own children - in the Blewett Pass area of Washington state Tuesday evening, the Chelan County Sheriff’s Office said in a news release.

The Chelan County Sheriff’s Office has deputies searching the area of Ingalls Creek and Valley High for suspect Travis Decker.

Travis Decker, wanted on murder and kidnapping charges, is the target of a manhunt after his three young daughters were found dead.

As trailheads and campgrounds reopen amid the search for Washington triple-murder suspect Travis Decker, homeowners in the area are still on high alert.

Chelan County Sheriff’s Office leads the manhunt for Travis Decker, accused of murdering his three daughters at a remote Washington campsite while using survival skills to evade capture.