Columbia River

Rises in Upper Columbia Lake, lat. 50° 10', long. 115° 50', and flows into Pacific Ocean. Total length about 1150 miles. Its mouth was discovered by Robert Gray, of Boston, May, 1792, and named by him after his ve el. It was first reached overland by Lewis and Clark, in 1805; and first explored throughout its entire length by David Thompson, of the North West Company, 1807-1811. Its principal branch is the Kootenay. Index : D Carver's "River of Oregon," 19; Ru ian colony projected at, 44; named by Gray, 57; Fraser raised mistaken for, 59; Lewis and Clark on, 67.