The only very rugged part of the route is in crossing the Big Horn mountain, which is about 30 miles wide.

"William Henry Ashley" Notable Names Database
American National Biography - Ashley William Henry. Though a native of Virginia Ashley had already moved to St.

Before the war he did some real estate speculation and earned a small fortune manufacturing gunpowder from a lode of saltpeter mined in a cave near the headwaters of Missouri's Current river. In 1826 he led an expedition into the Salt Lake Valley. South of the Great Salt Lake he discovered Utah Lake which he named Lake Ashley.