SOUTHERN PACIFIC LINES AAT 
both of which have cut deeply into them. There are fine exposures of 
these rocks on the ascent on the west side of Fish Creek, where the 
road climbs nearly 800 feet to gain the summit of the principal massive 
member, and also on the wide upland westward, which the road trav- 
erses on the divide between Fish Creek and Tortilla Creek. In a 
cavern called Hip Pocket, on the slopes near Fish Creek, American 
troops under General Crook cornered a band of outlaw Apaches and 
destroyed them all, in part by rolling stones onto them from the cliffs 
under which they were hiding. 
As shown in Figure 58, the principal structural] feature in this 
vicinity is a shallow syncline, which is plainly visible along the road 
for a long distance west. Tortilla Creek exposes the dark basal mem- 
ber of the succession. Mormon Flat, the lower part of the valley of 
this creek, at its junction with the Salt River, is flooded by the 
reservoir known as Canyon Lake (pl. 29, B), which is held by a dam 
built in 1923-1925 in a bend of the Salt River just below Tortilla 
Creek. The river enters the reservoir through a gap near the lower 
end of the wide portion of the lake. The dam is 350 feet long and 
229 feet high above bedrock, which lies about 70 feet below the bed 
of the river. It cost about $1,257,000, and the power plant, which 
develops 10,000 horsepower, an additional $500,000 
The Stewart Mountain Dam, holding the Sahuaro Reservoir, is 10 
miles below the Mormon Flat Dam and 7 miles north of the Apache 
Trail, in a narrow part of the Salt River Canyon where the river passes 
through walls of granite. It is 210 feet high above bedrock and cost 
$2,300,000 for the dam and a power system of 17,500 horsepower. 
The storage capacity is about 70,000 acre-feet. 
From Canyon Lake the road climbs rapidly to a divide consisting of 
the rhyolite tuffs and lavas of the volcanic succession, dipping north 
at moderate angles and showing many details of the relations of 
various lava flows and tuff accumulations. At many places the old 
Apache Indian trail is visible near the road. Not far beyond the 
summit in Apache Gap, Superstition Mountain comes into view, a 
huge pile of the same volcanic succession just crossed by the road but 
lying nearly horizontal and on a base of granite, which is revealed at 
a few points, (See pl. 31, B.) The precipitous west front of this 
mountain is skirted by heer highway to and beyond the old Goldfield 
camp, which has produced considerable ore. Superstition 
Mountain is a famous subject for photographers and painters and 
probably appears in more pictures than any other mountain in the 
West. In the foreground are usually shown the sahuaro, cholla, and 
some other cacti and desert plants which are conspicuous in this region. 
A short distance north of Superstition Mountain and visible from 
points near Goldfield is Weavers Needle, a sharp peak of voleanic rock. 
In this vicinity was the Lost Dutchman mine, reported to have had 
wonderful richness. Many futile attempts have been made to find it. 
152109°—33——15 
