174 GUIDEBOOK OF THE WESTERN UNITED STATES. 
From Lordsburg to Azusa the irrigated areas are almost continuous, 
and many extensive and beautiful orchards may be observed at fre- 
quent intervals. Water for irrigation is brought from San Gabriel 
Canyon, and large amounts are pumped from wells and distributed 
by numerous canals. 
North of San Dimas (dee’mas) a mass of sandstones and shales with 
interbedded volcanic rocks is exposed at the foot 
San Dimas. of the mountains. The beds dip north toward the 
oe ea older rocks of the range, from which they are sepa- 
rated by a fault. 
Near milepost 112, halfway between San Dimas and Glendora, the 
train crosses the dry wash of San Dimas Creek, which heads in a 
large canyon a few miles to the northeast. It isa good example of a 
wash formed by a powerful intermittent stream. Beyond San Dimas 
Wash the train skirts the east end and north side of an isolated hill 
consisting of Tertiary sandstone and shale and enters the village of 
Glendora. 
From Glendora to Azusa and in a wide area on the south are 
numerous orange groves and other orchards, most of them irrigated 
y canals from San Gabriel River, which comes out of 
a a6 large canyon a few miles to the northwest. Pump- 
KansasCity 1,782miles, 9 Plants also add to the supply, for there is consid- 
erable water in the sand and gravel under the plain. 
Near Azusa the railway is within a mile of the foot of the steep 
southern front of the San Gabriel Mountains, which has been followed 
all the way west from the mouth of Cajon Canyon 
oe and continues to Los Angeles. Two miles west of 
Semele Azusa the train crosses San Gabriel Wash, the bed 
ansasCity 1,785miles. Of San Gabriel River, the largest stream flowing from 
the San Gabriel Mountains. The canyon through 
which the San Gabriel emerges from the mountains is in sight about 
3 miles northeast of the trestle over the wash. During the rainy 
season San Gabriel River is a stream of considerable size, furnishing 
water for irrigating many citrus groves and other orchards and fields 
on the slope south of the mountains. During the dry periods it 
dwindles to a mere brooklet, even within the canyon. Under ordi- 
nary conditions the wash below the canyon is dry between the canyon 
mouth and a point 10 or 12 miles to the southwest, where the water 
breaks out in springs. Some of it also comes out in Lexington Wash, 
near El Monte. In times of freshet a large volume of water passes 
down San Gabriel Wash, as may be inferred from the large bowlders 
in its bed. These bowlders are crushed for road material and other 
uses. The crusher and deep pit are on the south side of the track 
and a large amount of material is available in masses convenient to 
elevate directly into the crusher, 
Glendora. 
