143), gives its altitude above the sea as 4890 feet; and credits this number to the _Pacific Railroad Reports_.

But as this exact number appears in Fremont's _Report of Exploring Expedition to Oregon and North California in the Years 1843-44_.

(Doc.No.166, p.

217), it is probable that the first rude and necessarily imperfect estimate has been copied by subsequent authorities.

This number is evidently more than 800 feet too great; for the railroad station at Wadsworth (about eighteen or twenty miles from the lake), where the line of the railroad leaves the banks of the Truckee River, is only 4077 feet above the sea-level.