Yellowstone River at Elk Island

Beaver is very plenty on this part of the Rochejhone. The river widens    I think it may be generally Calculated at from 500 yards to half a mile in width
William Clark

Yellowstone River flowing around a very large island

Photo date: July 27, 2011.

Yellowstone River Side Channel

passed three large dry Brooks on the Stard. Side and four on the Lard Side.
William Clark

A dried side channel of the Yellowstone River

Photo date: July 27, 2011.

Tongue River

late in the evening I arived at the enterance of a River which I take to be the Lazeka or Tongue River it discharges itself on the Stard. Side and is 150 yards wide of water    the banks are much wider.
William Clark

Blue sky reflected on a small river

Photo by the United States Geological Survey.

White Cliffs

at 11 A. M. we passed that very interesting part of the Missouri where the natural walls appear, particularly discribed in my outward bound journey.
Meriwether Lewis

White cliffs of the Missouri River

Photo 2006 by the United States Bureau of Land Management.

Bighorn Sheep (Ovis canadensis)

on our way today we killed 9 bighorns of which I preserved the skins and skeletons of 2 females and one male....these animals abound in this quarter keeping themselves principally confined to the steep clifts and bluffs of the river.
Meriwether Lewis

Large Bighorn Sheep

Photo 2006 by Jon Sullivan who has released it to the public domain.