“he observed the snow clad top”

William Clark took frequent side trips during the journey, sometimes climbing hills to get a better view of the surrounding countryside. On April 22, 1806, Clark scaled Haystack Butte, the highest hill on this side of the river (over your left shoulder). From atop this butte Clark had "an extensive view of the country" and noted, "I could plainly See the range of Mountains which runs South from Mt. Hood as far as I could See."
The "range of Mountains" Clark saw was the Cascade Range. From his higher viewpoint — now private property and not publicly accessible — Clark could clearly see Mount Jefferson. The explorers had first sighted "a high mountain SE. Covered with Snow which we call Mt. Jefferson" on March 30, 1806, naming the peak in honor of President Thomas Jefferson.
April 22, 1806
"he observed the range of mountains in which Mount Hood stands to continue nearly south as far as the eye could reach. he also observed the snow clad top of Mount Jefferson which boar S. 10 W. Mount Hood from the same point boar S. 30 W... Capt C. also discovered some timbered country in a Southern direction from him at no great distance."
— Meriwether Lewis
Mount Jefferson
Mount Jefferson



stands 10,195 feet high and is one of 13 major volcanic peaks of the Cascade Range. Other peaks Lewis and Clark sighted include Mount Rainier, Mount St. Helens, Mount Adams and Mount Hood. Although Mount Jefferson has not erupted in approximately 15,000 years, geologic evidence suggests large, violent eruptions occurred in the past.
The Cascades
From this viewpoint, lower than Captain Clark's, you can't see Mount Jefferson, but you can see 11,239-foot-high Mount Hood. The Cascade Mountains stretch from northern California to southern British Columbia. The range includes many snow-capped volcanoes, some of which are still active. Mount St. Helens erupted in 1980. The U.S. Geological Survey continuously monitors the seismic activity of the Cascades.

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