rJA4NZTARY, 191 1. MONTHLY WEATHER REVIEW. 103
COLORADO RIVER SIPHON TUNNEL.
By L. N. JESUNOFJKT, Section Director.
It is probable that the Reclanintion Service will begin the work of tuiiiieling the C'oloraclo River near Yuma,
Ariz., within a short period. It, is stated that the water roblein, which has for such a long time delayed the
Rrealcing tlirougli ttie concrete wall of the Lkrizoiia sliaft, hits been satisfactorily adjusted. A List installnieiit of
concrete 'has been forced down aiicl itroiiiiil the outside
of the shaft to put an end to the water see ling t81iroiigh. When this liardens sufficiently, the shaft, \VI \ 1 be puiiipecl
dry, and everything will be in readiness for the work of
tunneling. As showing how close the reclanintion engineers are to
the tunneling point, it ninp be stated, with definiteiiess,
that the frame or slide in which cages will run, to convey
men and nirtterial to nncl froni nncl to carry the rock
takeii out of the tunnel, lias been pliicecl in position. At tlie present time, however, t8he shaft contains a
great volume of water, purposely rtllomecl therein, in
order that the latest additions of cement may properly
harden. The puinps are idle, but when the are started it will require. only a short time t o remove t K e water.
COMPLETION OF THE ROOSEVELT DAM, SALT RIVER
VALLEY, ARIZ.
By L. N. JEWNOFEKI-, Section Director.
The Roosevelt Dam, a part of the Salt River irrigation
project of Arizona, has been coinpleted ant1 will be officially opened on Ahrch 1s nest. According to a
stateineiit issued by the United States Reclainatioii Y erv-
ice, the last stone was placed in position in tlie parapet walls late in January.
The clniii is 2% feet high, 1,OSO feet long, and is
coveretl by R SO-foot roacl~vay. The waters will he used
t o irrigate more than 200,000 acres of land near Phoenix, Ariz.
The recent snows and heavy rains have already put a
large volunie of water in this storage reservoir.