"... from the enterance of this river, I can plainly See Mt. Jefferson which is high and Covered with snow S.E. Mt. Hood East, Mt St. Helians a high humped Mountain to the East of Mt St. Helians. I also Saw the Mt. Raneer Nearly North ..." [Clark, April 2, 1806]

From Lewis's Journal:

"... from the Columbia at the entrance of the Multnomah river Mount Jefferson bears S. E. this is a noble mountain. I think equally as high as Mount St. Helines but it's distance being much greater than that of the latter, so great a portion of it dose not appear above the range of mountains which lie betwen boath those stupendious mountains and this point of view. like mount St. Heleans it's figure is a regular cone and is covered with eternal snow. M. St. Heleans from the same point boar N [blank], Mount Hood due East, and Mount Ranier nearly North. there is also a very high humped mountain a little to the East of Mount St. Heleans which appears to lie in the same chain with those conic pointed mountains before mentioned ..." [Lewis, April 6, 1806]

Visible were two peaks in Oregon -- Mount Jefferson, which Lewis and Clark had only seen and named three days earlier, and Mount Hood. Visible in Washington State were three peaks -- Mount St. Helens, the "high humped Mountain to the East of Mt St. Helians" which is Mount Adams, and further north is Mount Rainier.