LEWIS & CLARK
'One tough part of the <a href="http://www.j-archive.com/media/2006-02-27_DJ_26.jpg" target="_blank">journey</a> up the Missouri was portaging <a href="http://www.j-archive.com/media/2006-02-27_DJ_26a.jpg" target="_blank">this feature</a> of the river in June & July 1805'
the Great Falls (on the Missouri)