Explore Map Collection

Check out our basemaps

Print a Map Plus

Generate a high-quality PDF

Discover local flora, fauna, geology, and more

Local Flora & Fauna

Learn the ecology of your area

Learn the geologic formation at your feet

Get Started or Sign In

Welcome

Sign up to start exploring the one-of-a-kind Natural Atlas Topo map

Continue with Apple

Or

Already have an account? Sign In

MAP

Topo

Rock Formations

Measure

Copyright © Natural Atlas | Roads, Buildings © OSM Contributors | Data Sources

Topo

Ecoregions

Public Lands

...

BASEMAPS

Default Weather

Temperature

Smoke

...

WEATHER

Pompeys Pillar

Rock Bearing William Clark's Inscription from 1806

Pillar on Yellowstone River, Pompeys Pillar Creek in Pompeys Pillar NM, Great Plains near Pompeys Pillar, MT

Official Website

Generate High-Quality PDF

Historic

Yes

“This rock I ascended and from it’s top had a most extensive view in every direction on the Northerly Side of the river high romantic Clifts approach & jut over the water for Some distance both above and below…I marked my name and the day of the month and year."

— William Clark

Taxonomy

Classified As

Waterbodies

Yellowstone River

Pompeys Pillar Creek

Geologic Formation

Gravel (MTQgr;0)

Geologic Formation