In response to the need to have more current information about streamflow characteristics in Montana, the U.S. Geological Survey, in cooperation with the Montana Department of Environmental Quality, Confederated Salish and Kootenai Tribes, and Bureau of Land Management, conducted a study to analyze streamflow data. Updated statistical summaries of streamflow characteristics are presented for 286 streamflow-gaging sites in Montana and adjacent areas having 10 or more years of record for water years 1900 through 2002. Data include the magnitude and probability of annual low and high flow, the magnitude and probability of low flow for three seasons (March-June, July-October, and November-February), flow duration of the daily mean discharge, and the monthly and annual mean discharges. For streamflow-gaging stations where 20 percent or more of the contributing drainage basin is affected by dams or other large-scale human modification, streamflow is considered regulated. Separate streamflow characteristics are presented for the unregulated and regulated periods of record for sites with sufficient data.
Purpose and Scope
Methods of Creating the Statistical Summaries
Annual and Seasonal Low-Flow Frequencies
Annual High-Flow Frequency
Monthly and Annual Mean Discharges
Statistical Summaries of Streamflow
McCarthy, P.M., 2005, Statistical summaries of streamflow in Montana and adjacent areas, water years 1900 through 2002: U.S. Geological Survey Scientific Investigations Report 2004-5266, 317 p.
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Download the Full Report (PDF, 22.2MB). (Figure 1 on page 3 in this document is an 11 x 17 page. Use figure 1 below for printing.)
For faster downloading, the report has been split into the following files:
Front covers (PDF, 181KB)
Title pages, Contents, Conversion factors, datum, symbols, acronymns, and abbreviations (PDF, 54KB)
Abstract, Introduction, Methods of Creating the Statistical Summaries, Statistical Summaries of Streamflow (PDF, 470KB)
Figure 1 is 11 x 17 (PDF, 228KB)
Statistical summaries - sites 1-69 (PDF, 5.2MB)
Statistical summaries - sites 70-137 (PDF, 5.2MB)
Statistical summaries - sites 138-205 (PDF, 5.2MB)
Statistical summaries - sites 206-286 (PDF, 6.0MB)
Selected references (PDF, 45KB)
Back covers (PDF, 62KB)
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Send questions or comments about this report to the author, P.M. McCarthy (406) 457-5934.
For more information about USGS activities in Montana, visit the USGS Montana Water Science Center home page.
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Last modified: Thursday, January 10 2013, 06:38:58 PM