8 " 103 " 12.87 "
Vista to Clark's 12 " 141 " 11.75 "
Clark's to Wadsworth 15 " 186 " 12.40 "
Wadsworth to Pyramid Lake 18[1] " 187[1] " 10.39 "
______ _______ _______
Lake Tahoe to Pyramid Lake 103 " 2357 " 23.11 "

[Footnote 1: The elevation of Pyramid Lake above the sea-level
has never, as far as we know, been accurately determined.
Henry Gannet, in his _Lists of Elevation_ (4th ed.,
Washington, 1877, p. 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. So that these numbers would make Pyramid Lake 813
feet above the level of its affluent at Wadsworth; which,
of course, is impossible. Under this state of facts, I have
assumed the elevation of this lake to be 3890 feet.]

During the summer of 1873, the writer embraced the opportunity
afforded by a six weeks' sojourn on the shores of the Lake to
undertake some physical studies in relation to this largest of
the "gems of the Sierra." Furnished with a good sounding-line
and a self-registering thermometer, he was enabled to secure
some interesting and trustworthy physical results.

(1.) _Depth_. It is well known that considerable
diversity of opinion has prevailed in relation to the
actual depth of Lake Tahoe. Sensational newsmongers have
unhesitatingly asserted that, in some portions, it is
absolutely fathomless. It is needless to say that actual
soundings served to dispel or to rectify this popular
impression. The soundings indicated that there is a deep
subaqueous channel traversing the whole Lake in its greatest
dimension, or south and north. Beginning at the southern end,
near the Lake House, and advancing along the long axis of the
Lake