UNDEKGKOUND WATERS. 75 
good quality and is derived either from the lower beds of the Tertiary 
or from a sandstone in the underlying Montana. The material 
penetrated was reported as "drab shale." 
Arlington. — A flow of about 1 gallon a minute is reported from a 
well of unknown depth in the southwest corner of the SE. J sec. 35, 
T. 19 N., R. 78 W v 5 miles southeast of Arlington. The water is cold 
and of good quality and is probably derived from sandstone in the 
Montana. 
SPRINGS. 
Springs occur at widely separated localities throughout the Laramie 
Basin, especially along the slopes at the foot of the mountains. They 
are the sources of supply for numerous ranches, many of which owe 
their location to the existence of a spring to furnish water for cattle 
and house use. 
A series of very large springs issues from the limestones at the foot 
of the Laramie Mountains east and south of Laramie. From one of 
these, situated in the SE. \ sec. 35, T. 16 X., R. 73 W., Laramie is sup- 
plied with fine water for drinking and for the irrigation of the lawns, 
gardens, and numerous trees that make the city appear like an oasis. 
The water, which issues 114 feet higher than the city, is conducted 
into covered reservoirs and thence piped to the consumers. The 
analysis, given on page 76, shows that it is somewhat hard, but this 
can be remedied by boiling or the use of lime water. Its volume is 
estimated at 3,000,000 gallons a day. 
Four miles due south of this spring is another similar but smaller 
one which supplies Soldier Creek and from which the fish hatchery 
obtains an abundant supply of cool water. (See PI. VII, B.) 
Springs at the J. Simpson ranch, 2 J miles farther south, also supply 
good water in large volume. 
Mud Springs, at the foot of Laramie Mountain 6 miles northeast of 
Wyoming station, are the source of a running stream of moderate size. 
A spring situated in Spring Canyon, 1 to 2 miles east of Colores 
station, on the Union Pacific Railroad, supplies water of fine quality, 
which is piped to the tank at the station. Its flow keeps a 4-inch pipe 
nearly full. 
McGibbons Spring, in the SE. \ XE. J sec. 29, T. 14 X., R. 73 W., 
supplies a large fish pond, the overflow of which forms a considerable 
addition to Willow* Creek. 
Willow Spring rises in a grassy, willowy quagmire several acres in 
extent in sec. 15, T. 13 X., R. 73 W. Its total discharge is between 
one-half and 1 second-foot and the quality of its water is good. 
Sybille Springs, in Plumbago Canyon 8 miles east of Lake lone, are 
the principal source of supply for Sybille Creek. 
