Page 352 - 1915, Springs of CA.

332 SPRINGS OP CALIFORNIA.
which rises near it. The cold spring issues in full volume from be-
neath a small bank that is composed of lime-carbonate spring deposit
and fragmental lava. It yields about 2,700 gallons a minute (re-
ported measurement, 300 miner's inches) of water of very good
quality that is used to irrigate meadowland to the west.

LARGE COLD SPRINGS NORTH OF SISSON (SISKIYOU 17).
A large amount of cold water rises in two springs at the west base
of Black Butte, which is 1 mile north of Sisson, at the western base
of Mount Shasta. The northern spring issues in a dense growth of
vines and willows on the border of a strip of meadow and forms a
stream carrying approximately 700 gallons a minute. The other
spring, 125 yards southward, rises mainly in a cement-walled basin
15 or 20 yards across. A part of its yield escapes to the meadow
through an overflow weir, but the main flow is conducted in a canal
southeastward and is used for irrigation. Measurements of the total
yield of the two springs gave approximately 12,000 gallons a minute,
of which about 85 per cent was flowing in the canal. These springs
form the largest tributary at the head of Sacramento River and are
sometimes referred to as its source.
LARGE COLD SPRINGS AT HEAD OF MUD CREEK (SISBIYOU 16).
At the head of Mud Creek, on the southern slope of Mount Shasta,
are large cold springs whose water is muddy from suspended material
that seems to be a glacial clay or rock flour. The source of the
springs is evidently the snow of the higher slopes.
LARGE COLD SPRINGS SOUTH OF McCLOUD (SISKIYOU 27).
Cold springs rise in a small marshy area along a creek 1J miles
south of McCloud, in the basaltic lava plateau at the southern base
of Mount Shasta. The water forms a stream of considerable flow,
which has been mentioned in the description of Warmcastle Soda
Springs (Siskiyou 28, p. 223).

LARGE COLD SPRINGS ON EAST SLOPE OF MOUNT SHASTA (SISKIYOU 15).
Cold springs that are similar to the others in the vicinity of Mount
Shasta issue on its east slope. They form a stream that i? tributary
to Ash Creek and through it to McCloud River. Other cold springs
of smaller size issue at a number of places on the slopes of Mount
Shasta and form streams of nearly constant flow. The source of all
the springs is evidently the precipitation on the mountain. Con-
siderable areas on its lower slopes are covered with coarse gravel
that is probably of glacial origin. The town of Sisson is built on