926 GUIDEBOOK OF THE WESTERN UNITED STATES. 
The Triassic red beds extend nearly a mile west of the mouth of 
Diamond Creek, to a place where they are probably terminated by a 
fault which separates them from the Carboniferous and older rocks 
that form the core of the Wasatch Range. The 
rocks of the mountains are of Carboniferous age 
but are so poorly exposed and so complicated in 
structure that it is useless to attempt to describe 
them. From some limestones of this formation comes the 
sulphur water which has made Castilla (cas-tee’yah) Hot Springs a 
noted resort. 
The Wasatch Mountains, although not equal in height to the Rocky 
Mountains of Colorado or the Sierra Nevada of California, are never 
theless one of the dominating ranges of the continent, and their 
peaks range in elevation from 10,000 to more than 12,000 feet. The 
impressiveness of the range is due more to its situation than to its ele- 
vation, but both unite to make it a noteworthy group of mountains. 
Dusing the great ice age this range supported a number of glaciers 
(see the map opposite p. 244), but the glaciers were neither so large 
nor so numerous as those of the Rocky Mountains. 
Since leaving Canon City the traveler has been either in the Rocky 
Mountains or in what is generally known as the Plateau country, so 
called because it is made up of a series of plateaus of different ele- 
vations, but when he passes through this canyon and emerges on the 
west front of the Wasatch Range he finds himself in a country that is 
very different from any that he has yet seen on this journey. This 
Castilla. 
Elevation 4,912 feet. 
Denver 685 miles 
mountains on the west there is not | again diverted into a canal for utiliza- 
sufficient water to irrigate all the land | tion, first for the development of elec- 
that is well adapted to farming. The | trie power and later for irrigation. 
problem, therefore, was to bring the | The hydroelectric plant is 34 miles be- 
water of Strawberry River across the | low the diversion dam in Spanish Fork, 
divide to the lands that needed it so | and the power is generated by drop- 
1 © accomplish this feat a | ping the water to the level of that 
dam 72 fi h was built across | stream, as s lat: XIX, 
eae River at a place called the The water is then carried to the 
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’ a constricted point in the | south end of Utah Lake and distrib- 
valley pert a part that is open and | uted to the land at that place and also 
well adapted to form a reservoir. A | on the east side. This land has been 
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19,897 feet (nearly 4 miles), so as to | Strawberry Valley will be sufficient Aa 
allow the water of ‘the reservoir to | irrigate about 54,000 acres of this land, 
flow through and discharge into th 
head of Diamond Creek, a tributary | ductive power of the State is made at 
of Spanish Fork. The water flows | the expense of a very slight loss to 
down Spanish Fork to the west side of | that part from which the water is 
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