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Quality of rivers of the United States, 1975 water year; based on the National Stream Quality Accounting Network (NASQAN)
John C. Briggs, John F. Ficke
1977, Open-File Report 78-200
The National Stream Quality Accounting Network (NASQAN) was established by the U.S. Geological Survey to provide a nationally uniform basis for continuously assessing the quality of U.S. rivers. Stations generally are at the downstream end of hydrologic accounting units in order to measure the quantity and quality of water flowing...
Joints, fissures, and voids in rhyolite welded ash-flow tuff at Teton damsite, Idaho
Harold J. Prostka
1977, Open-File Report 77-211
Several kinds of joints, fissures, and voids are present in densely welded rhyolite ash-flow tuff at Teton damsite. Older fissures and voids probably were formed in the ash-flow sheet during secondary flowage, which probably was caused by differential compaction or settling over irregular topography. The younger, more abundant fissures are...