Bulletin, Issue 685

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U.S. Government Printing Office, 1918 - Geology
 

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Page 21 - Undercliff, on the south-east coast, about six miles in length, and from a quarter to half a mile in breadth. The...
Page 5 - ... to the San Juan Mountains has led to the construction of a number of reservoirs and the planning of others to store water from melting snows and heavy rain and release it later as needed. Most of the reservoir sites are in the great glaciated canyons of the range, and the selection of some of them has apparently been determined by the occurrence of a narrow gorge or constricted portion in the canyon downstream from a broad, open portion. In some of these canyons, however, the narrow portions...
Page 5 - ... it later as needed. Most of the reservoir sites are in the great glaciated canyons of the range, and the selection of some of them has apparently been determined by the occurrence of a narrow gorge or constricted portion in the canyon downstream from a broad, open portion. In some of these canyons, however, the narrow portions have been formed by the deposition of large masses of loose materials of landslide or glacial origin, and such materials have not proved to be water-tight. On many projects...
Page 28 - ... formations within the area shown. the irrigation of lands in San Luis Valley. It is 2 miles from the junction of Beaver Creek with the South Fork of the Rio Grande and 5.6 miles in an air line west of south (about 7 miles by road) from the town of South Fork, on the Creede branch of the Denver & Rio Grande Railroad. (See fig. 10.) The dam is built across a narrow gorge at the lower end of a long stretch of meadow land known as Beaver Creek Park and is of sufficient height to back water for approximately...
Page 24 - Map of a part of the San Cristobal Quadrangle, showing the location and topographic relations of Santa Maria reservoir and the distribution of the loose or unconsolidated formations within area shown. Scale about one inch equals one mile, CI 100 feet. Geology by patterns in black. Bulletin No. 685, fig. 8, 1918. 340. Map of a part of the...
Page 28 - COLO. lake in the landslide mass just south of the reservoir had not risen with the rise of the water in the larger basin. Perhaps the ground was still frozen beneath the surface at that time early in the season, but if not, the reduction in the amount of seepage would seem to have removed all fear of serious trouble from that source. There are no other serious difficulties associated with this project. MOSCA RESERVOIR.
Page 34 - FIGURE 13. — Sketch map of the lower end of the Terrace reservoir, showing the general distribution of the frontal moraine that determined the location of the dam and reservoir site.
Page 5 - INTRODUCTION. With the increase in farming on the. lowlands bordering the San Juan Mountains, Colo., and on the broader valley floors within the range, there has come a demand for a large supply of water to be used for irrigation. This demand has been particularly urgent on the east side of the range, among the farmers and ranchmen of the San Luis Valley. Numerous reservoirs have been planned in which the...
Page 10 - In some places the ice has gouged out holes much below the general gradient ; in others rock hills or knobs have been left on the floors of the valleys. The debris left by the ice during its advance and upon its final melting has added numerous details in the topography of the canyon floors and the lower slopes, so that many of the postglacial streams in such canyons flow here on gentle gradients through meadow lands, there over rocky places where cataracts and rapids exist, or through some narrow...
Page 24 - Santa Maria Lake is a beautiful body of water resting in a long, narrow trough just west of Bristol Head, 4 miles northwest of Antelope Springs, near the eastern margin of the San Cristobal quadrangle. (See fig. 8 and PL III, A.) This reservoir may be reached from Creede by road, a distance of approximately 19 miles. EXPLANATION Lava flows or other volcanic formations near or at the surface FIGCEE 8.

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