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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2004-5089

Water, Ice, and Meteorological Measurements at South Cascade Glacier, Washington, Balance Year 2002

By William R. Bidlake, Edward G. Josberger, and Mark E. Savoca

ABSTRACT

Winter snow accumulation and summer snow and ice ablation were measured at South Cascade Glacier, Washington, to estimate glacier mass balance quantities for balance year 2002. The 2002 glacier-average maximum winter snow balance was 4.02 meters, the second largest since 1959. The 2002 glacier summer, net, and annual (water year) balances were -3.47, 0.55, and 0.54 meters, respectively. The area of the glacier near the end of the balance year was 1.92 square kilometers, and the equilibrium-line altitude and the accumulation area ratio were 1,820 meters and 0.84, respectively. During September 20, 2001 to September 13, 2002, the terminus retreated 4 meters, and computed average ice speeds in the ablation area ranged from 7.8 to 20.7 meters per year. Runoff from the subbasin containing the glacier and from an adjacent non-glacierized basin were measured during part of the 2002 water year. Air temperature, precipitation, atmospheric water-vapor pressure, wind speed and incoming solar radiation were measured at selected locations near the glacier.

CONTENTS

Abstract
Introduction
Study Methods
Results and Discussion
Summary and Conclusions
References Cited

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Send questions or comments about this report to the authors, W. R. Bidlake, (253) 428-3600 ext. 2641, E. G. Josberger, (253) 428-3600 ext. 2643, and M. E. Savoca, (253) 428-3600 ext. 2660.

For more information about USGS activities in Washington, visit the USGS Washington District home page.

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