Mammoth

Montana's ghost towns span gold-rush gulches and the great homestead bust that emptied the Hi-Line.

Mammoth is an unincorporated community and census-designated place (CDP) in Madison County, Montana, United States. It is in the northern part of the county, in the valley of the South Boulder River within the northern end of the Tobacco Root Mountains. Via the South Boulder River, it is part of the Jefferson River watershed, one of the headwaters of the Missouri River. Mammoth is reached by South Boulder Road, which leads north 11 miles (18 km) to Montana Highway 359 at a point 5 miles (8 km) south of Cardwell.

The on-the-ground condition of Mammoth is unverified — it's listed here with unknown status. That could mean standing buildings, or an empty field. Go prepared for either, and consider sharing what you find so the record improves.

Nobody has confirmed the access situation, so treat any visit as reconnaissance: verify land ownership first, and be ready to admire from the road.

Here's the honest truth: access to Mammoth is unverified. We couldn't confirm whether the site sits on public land, private property, or something in between — so verify land ownership and local rules before visiting, and respect private property at all times.

Ghost-town etiquette is simple: take only photographs. Removing artifacts is illegal on public lands and disrespectful everywhere else — and on federal land it can be a serious offense.