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Scientific Investigations Report 2014–5115

Prepared in cooperation with the Yellowstone River Conservation District Council and the U.S. Army Corps of Engineers

Streamflow Statistics for Unregulated and Regulated Conditions for Selected Locations on the Upper Yellowstone and Bighorn Rivers, Montana and Wyoming, 1928–2002

By Katherine J. Chase

Thumbnail of and link to report PDF (11.1 MB)Abstract

Major floods in 1996 and 1997 intensified public debate about the effects of human activities on the Yellowstone River. In 1999, the Yellowstone River Conservation District Council was formed to address conservation issues on the river. The Yellowstone River Conservation District Council partnered with the U.S. Army Corps of Engineers to carry out a cumulative effects study on the main stem of the Yellowstone River. The cumulative effects study is intended to provide a basis for future management decisions within the watershed. Streamflow statistics, such as flow-frequency data calculated for unregulated and regulated streamflow conditions, are a necessary component of the cumulative effects study.

The U.S. Geological Survey, in cooperation with the Yellowstone River Conservation District Council and the U.S. Army Corps of Engineers, calculated low-flow frequency data and general monthly and annual statistics for unregulated and regulated streamflow conditions for the Upper Yellowstone and Bighorn Rivers for the 1928–2002 study period; these data are presented in this report. Unregulated streamflow represents flow conditions during the 1928–2002 study period if there had been no water-resources development in the Yellowstone River Basin. Regulated streamflow represents estimates of flow conditions during the 1928–2002 study period if the level of water-resources development existing in 2002 was in place during the entire study period.

First posted July 11, 2014

For additional information contact:
Director, Wyoming-Montana Water Science Center
U.S. Geological Survey
3162 Bozeman Ave.
Helena, MT 59601
http://wy-mt.water.usgs.gov/

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Suggested citation:

Chase, K.J., 2014, Streamflow statistics for unregulated and regulated conditions for selected locations on the Upper Yellowstone and Bighorn Rivers, Montana and Wyoming, 1928–2002: U.S. Geological Survey Scientific Investigations Report 2014–5115, 117 p., http://dx.doi.org/10.3133/sir20145115.

ISSN 2328-0328 (online)



Contents

Acknowledgments

Abstract

Introduction

Methods for Calculating Streamflow Statistics for Unregulated and Regulated Conditions

Streamflow Statistics for Unregulated and Regulated Conditions for Selected Locations on the Upper Yellowstone and Bighorn Rivers

Summary

References Cited

Glossary

Appendixes

Appendix 1. Statistics for Unregulated and Regulated Streamflow Conditions for Selected Streamflow-Gaging Stations on the Upper Yellowstone and Bighorn Rivers, Montana and Wyoming, 1928–2002

Appendix 2. Locations, Drainage Areas, and Annual n-day Low-Flow Frequency Data for Unregulated and Regulated Streamflow Conditions at Selected Locations on the Yellowstone River, Montana and Wyoming, 1928–2002


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