The Recession of Glaciers in Mount Rainier National Park, Washington
THE RECESSION OF GLACIERS IN MOUNT RAINIER NATIONAL PARK, WASHINGTON C. FRANK BROCKMAN Mount Rainier National Park FOREWORD One of the most outstanding features of interest in Mount Rainier National Park is the extensive glacier system which lies, almost entirely, upon the broad flanks of Mount Rainier, the summit of which is 14,408 feet above sea-level. This glacier system, numbering 28 glaciers and aggregating approximately 40-45 square miles of ice, is recognized as the most extensive single peak glacier system in continental United States.' Recession data taken annually over a period of years at the termini of six representative glaciers of varying type and size which are located on different sides of Mount Rainier are indicative of the rela- tive rate of retreat of the entire glacier system here. At the present time the glaciers included in this study are retreating at an average rate of from 22.1 to 70.4 feet per year.2 HISTORY OF INVESTIGATIONS CONDUCTED ON THE GLACIERS OF MOUNT RAINIER Previous to 1900 glacial investigation in this area was combined with general geological reconnaissance surveys on the part of the United States Geological Survey. Thus, the activities of S. F. Em- mons and A. D. Wilson, of the Fortieth Parallel Corps, under Clarence King, was productive of a brief publication dealing in part with the glaciers of Mount Rainier.3 Twenty-six years later, in 1896, another United States Geological Survey party, which included Bailey Willis, I. C. Russell, and George Otis Smith, made additional SCircular of General Information, Mount Rainier National Park (U.S.
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