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The Black Canyon of the Gunnison: Today and Yesterday
Wallace R. Hansen
1965, Bulletin 1191
Since the early visit of Captain John William Gunnison in the middle of the last century, the Black Canyon of the Gunnison has stirred mixed apprehension and wonder in the hearts of its viewers. It ranks high among the more awesome gorges of North America. Many great western canyons are as...
The operation and maintenance of a crest-stage gaging station
John Friday
1965, Open-File Report 66-45
The purpose of this manual is to familiarize field personnel with the procedures involved in operating crest-stage gaging stations. Crest-stage gages are used to determine the elevation of a peak stage occurring at a specific location in a stream. A crest-stage gage consists of a length of 14-inch diameter pipe installed...
Gravity survey in the San Luis Valley area, Colorado
J. Robert Gaca, Daniel E. Karig
1965, Open-File Report 66-46
During the summers of 1963 and 1964, a regional gravity survey covering 6,000 square miles of the San Luis Valley and surrounding areas was made to determine subsurface basement configurations and to guide future crustal studies. The San Luis Valley, a large intermontane basin, is a segment of the Rio...