Hellroaring Beta

Here's what you need to know about Hellroaring Creek:

Put-in: From Big Timber drive south about 52 miles up the main Boulder road (Hwy 298) to Sheep Creek trailhead. A high-clearance 4WD vehicle and white-knuckle driving skills are required for the last five miles of dirt road (if you wanna call it a road).
Take-out: Hellroaring trailhead between Mammoth Hot Springs and Tower-Roosevelt inside Yellowstone National Park.

Distance (hike and boat)
From the Sheep Creek trailhead, hike 3.4 miles on Forest Service Trail 257 to the top of the pass. Then hike 6.4 miles on FST 12 down the middle fork to the confluence of the west fork in Bull Moose meadows. It's a total of 9.8 miles of relaxing backpacking over a mountain pass (aka, carrying a heavy plastic object through the woods with way too much shit in it).

Put-in at the confluence of the west and middle forks. You'll then boat roughly 11.5 miles to the Park boundary. Be aware that the boundary is situated directly between two ranger patrol cabins, so to avoid unnecessary court appearances, simply pick-up your boats and proudly hike them four miles to the road.

A class IV-V two- to three-day self-support mission.