Found poem, from Lewis and Clark's journal entry for 25 August, 1804:

Such terror we had:

North 20 degrees west, 8 o’clock;

Four miles, 23 yards wide, 2 miles further.

Want of water,

Complaining of great thirst.

Rises from the north and south, a steep ascent to leave a level plain.

Beliefs in origins – most probably the production of nature.

The plains are open, void of timber

Level to a great extent (hence the wind over the naked plains

And against this hill)

Fly to its leeward side for shelter.

One evidence: a large assemblage of birds about this mound

Produce in the savage mind a confident belief in this

most beautiful landscape.