Page 244 - 1915, Springs of CA.

226 SPRINGS OP CALIFORNIA.

There are said to be other small carbonated springs on a branch of
McCloud River several miles eastward.

CASTLE BOCK SPRINGS (SHASTA 4).
Castle Rock Springs rise along the side of Sacramento River 5
miles west of south from Dunsmuir. One spring, which formerly rose
in the eastern edge of the river, has been protected by a concrete wall,
the ground about it has been filled in, and part of its flow now issues
in a cemented drinking basin. The water is pleasantly carbonated
and also has a distinct taste and odor of hydrogen sulphide. Bottled
water from this spring has been marketed since about 1903. It is
pumped by water power to a bottling house at the west side of the
river, beside the railroad, and is passed over a series of slate plates
to aerate it and thus remove the hydrogen sulphide before bottling.
The following analysis shows the water to be primary alkaline saline
and secondary alkaline, like that of the other principal springs in the
locality:
Analysis of water from main spring, Castle Rock Springs, Shasta County, CaL
[Analyst, Thomas Price & Son. Authority, advertising matter. Constituents are in parts per million.]
Properties of reaction:
43
0
0
Primary alkalinity 23
34
3
Constituents. By Reacting
weight. values.
766 33.32
16 .41
.1 .02
.3 Trace.
127 6.34
133 10.94
Iron (Fe)........................................................... ................ .4 .01
12 1.35
.2 .01
Chloride (Cl).......... .............................................................. 771 21.74
Carbonate (COS). ................................................................... 870 29.32
49 1.63
2,745.0

Two other carbonated springs are situated on the western edge of
the river 100 yards above the main spring. One of these has been
protected by a joint of tile pipe and the other by a board curbing.
Both are moderately carbonated and have been used as drinking
springs.
Castle Rock Springs issue from dark-colored lava, probably basaltic,
that here forms the bed of the river as well as its banks and is the
extension down the river of a narrow lava flow from Mount Shasta.