Sergt. Gass’ Unauthorized

Historical Tours of Montana & Idaho

Change your perspective on the Lewis & Clark Trail.

From Lewis & Clark Pass to Lost Trail, from the Big Hole to the Blackfoot, custom floats, hikes & expert guiding services provided for individuals and small groups of all abilities. Inspired by Patrick Gass, who could hike four miles a day until the age of 99.

Patrick Gass

Veteran, carpenter, and first published author of a personal account of the Lewis & Clark Expedition.

Outfitted Historical

Trips & Tours

Canoe the Wild & Scenic

Upper Missouri River Breaks

Float through the famed White Cliffs on three-day or seven-day outfitted excursions, July 2024​.

Hike the Ancient, High-Altitude

Lolo Trail

Hike the roughest terrain of the Lewis & Clark National Historic Trail on this three-day, truck-assisted tour, July 6th – 8th, 2024.​

Choose Your Own Adventure

Custom Tours

If the Corps of Discovery walked or floated it, you can too. (I might know a guy with a boat.)

Sergt. Gass’ Legacy

The First Published

JOURNAL

of the Voyages and Travels of a Corps of Discovery,
Under the Command of Capt. Lewis and Capt. Clarke of the Army of the
United States
from
the Mouth of the River Missouri through the Interior Parts of North America to the Pacific Ocean,
During the Years 1804, 1805, & 1806