REPORT:
Debris Flows from Failures of Neoglacial-Age Moraine Dams in the Three Sisters and Mount Jefferson Wilderness Areas, Oregon

Table of Contents

• Abstract
• Introduction
  • Background
  • Purpose and Scope
  • Acknowledgments
• The Central Oregon Cascade Range
  • Physiography
    • Geologic and Topographic Setting
    • Climate and Vegetation
    • Glaciers
  • Previous Work
• Neoglaciation in the Central Oregon Cascade Range
  • Neoglaciation and Little Ice Age Chronology and Deposits
    • Chronology
    • Neoglacial Deposits
  • 19th- and 20th-Century Glacier Behavior
    • Glacier Activity
    • Climatic Forcing
• Moraine-Dammed Lakes
  • Distribution
  • Chronology
  • Lake Basin Bathymetry and Topography
  • Formation and Preservation of Moraine-Dammed Lakes
• Debris Flows from Lakes Dammed by Neoglacial Moraines
  • General Features
  • Indirect Discharge Estimation Methods
    • Velocity-Area Discharge Estimates
    • Critical-Flow Discharge Estimates
  • Case Studies in the Central Oregon Cascade Range
    • Mount Jefferson Wilderness Area
      • Easter Jefferson Park
      • West Jefferson Park
      • Waldo Glacier
      • Jack Glacier
    • Three Sisters Wilderness Area
      • Collier Glacier
      • Diller Glacier
      • Eugene Glacier
      • East Bend Glacier
  • Processes
    • Breaching of Moraine Dams
    • Downstream Flow Characteristics
• Evaluation of Hazards from Moraine-Dammed Lake Breakouts
  • Assessing Potential Failure of Moraine Dams
    • Topographic Setting
    • Likelihood of Future Breaches in the Central Oregon Cascade Range
  • Assessing Downstream Flow Hazards
    • The Outflow Hydrograph at the Breach
    • Downstream Flow Behavior
• Conclusions
• References Cited

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