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U.S. GEOLOGICAL SURVEY
Open-File Report 2007–1048

Chemical and hydrologic data from the Cement Creek and upper Animas River confluence and mixing zone, Silverton, Colorado, September 1997

By Marisa H. Cox and Laurence E. Schemel

Abstract

Cement Creek, an acidic tributary, discharges into the circum-neutral Animas River (pH>7) in Silverton, Colorado located in the high-elevation San Juan Mountains. Mixing of Animas River water with acidic metal rich Cement Creek water raises downstream pH and produces metal precipitates. This report presents selected anion, cation, chloride, and sulfate data along with hydrologic data highlighting the mixing of these streams during the low-flow period in late summer 1997.

Contents

Abstract
Introduction
Methods
Field Data
References Cited

This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.

Download the report (PDF, 242 KB)

Download Data File (Excel, 80 KB)

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Send questions or comments about this report to the authors, M.H. Cox, (650) 329-4345, and L.E. Schemel, (650) 329-4436.