The Cougar Traverse doesn’t seem like an official route or thru hike of any type. Regardless, it is still similar in length to the John Muir Trail, Sierra High Route, and other trails/routes that are more established. We came across the Cougar Traverse on the Fastest Known Time website because Cristof Tuescher set an FKT on it in 2019. It seems like the route was created, or possibly just recently linked together, by Mike Woodmansee in his guidebook Trekking Washington.