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Landform Mapping at North Cascades National Park Service Complex, Washington

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Landform Mapping at North Cascades National Park Service Complex, Washington National Park Service U.S. Department of the Interior Natural Resource Stewardship and Science Geomorphology of the Stehekin River Watershed Landform Mapping at North Cascades National Park Service Complex, Washington Natural Resource Technical Report NPS/NCCN/NRTR—2012/566 ON THE COVER Oblique air photograph looking northwest at the lower Stehekin valley; prominent landmarks in the photo include the Buckner Orchard and Rainbow Falls. Photograph by: Stephen Dorsch, North Cascades National Park Geomorphology of the Stehekin River Watershed Landform Mapping at North Cascades National Park Service Complex, Washington Natural Resource Technical Report NPS/NCCN/NRTR—2012/566 Jon Riedel Stephen Dorsch Jeanna Wenger National Park Service North Cascades National Park 7280 Ranger Station Road Marblemount, Washington 98267 April 2012 U.S. Department of the Interior National Park Service Natural Resource Stewardship and Science Fort Collins, Colorado The National Park Service, Natural Resource Stewardship and Science office in Fort Collins, Colorado publishes a range of reports that address natural resource topics of interest and applicability to a broad audience in the National Park Service and others in natural resource management, including scientists, conservation and environmental constituencies, and the public. The Natural Resource Technical Report Series is used to disseminate results of scientific studies in the physical, biological, and social sciences for both the advancement of science and the achievement of the National Park Service mission. The series provides contributors with a forum for displaying comprehensive data that are often deleted from journals because of page limitations. All manuscripts in the series receive the appropriate level of peer review to ensure that the information is scientifically credible, technically accurate, appropriately written for the intended audience, and designed and published in a professional manner. This report received informal peer review by subject-matter experts who were not directly involved in the collection, analysis, or reporting of the data. Views, statements, findings, conclusions, recommendations, and data in this report do not necessarily reflect views and policies of the National Park Service, U.S. Department of the Interior. Mention of trade names or commercial products does not constitute endorsement or recommendation for use by the U.S. Government. This report is available from the North Coast and Cascades Network (http://science.nature.nps.gov/im/units/nccn/reportpubs.cfm) and the Natural Resource Publications Management website (http://www.nature.nps.gov/publications/nrpm/). Please cite this publication as: Riedel, J., S. Dorsch, and J. Wenger. 2012. Geomorphology of the Stehekin River watershed: Landform mapping at North Cascades National Park Service Complex, Washington. Natural Resource Technical Report NPS/NCCN/NRTR—2012/566. National Park Service, Fort Collins, Colorado. NPS 168/113504, April 2012 ii Contents Page Contents ......................................................................................................................................... iii Figures........................................................................................................................................... vii Tables ............................................................................................................................................. ix Abstract .......................................................................................................................................... xi 1 – Introduction ............................................................................................................................... 1 1.1 Applications of Landform Mapping Data ................................................................................. 1 1.2 Project History .......................................................................................................................... 2 2 - Study Area ................................................................................................................................. 3 2.1 Geographic Setting.................................................................................................................... 3 2.2 Geologic Setting........................................................................................................................ 6 2.2.1 Tectonics and Structure .............................................................................................. 6 2.2.2 Geologic Units ........................................................................................................... 6 2.3 Glacial History .......................................................................................................................... 7 2.3.1 Neoglacial .................................................................................................................. 9 2.4 Climate ...................................................................................................................................... 9 2. 5 Hydrologic Setting ................................................................................................................. 11 2.6 Vegetation ............................................................................................................................... 13 3 – Landform Mapping at NOCA ................................................................................................. 15 3.1 National Hierarchical Framework for Ecological Units ......................................................... 15 3.1.1 Subsection (1:250,000) ............................................................................................ 15 3.1.2 Landtype Association (1:62,500) ............................................................................. 16 3.1.2 Landtype Phase (Landform) (1:24,000) ................................................................... 17 3.2 Landform Age ......................................................................................................................... 18 iii Contents (continued) Page 3.2.1 Landforms and Soils ................................................................................................ 19 4 - Methods ................................................................................................................................... 21 4.1 Preliminary Methods ............................................................................................................... 21 4.2 Field Methods ......................................................................................................................... 21 4.3 Digitizing Methods ................................................................................................................. 21 4.4 Areas Surveyed ....................................................................................................................... 22 5 - Results and Discussion ............................................................................................................ 23 5.1 General Watershed Overview ................................................................................................. 23 5.1.1 High Elevation Landforms ....................................................................................... 24 5.2 Characteristics of Sub-Watersheds ......................................................................................... 25 5.2.1 Main Stem of Stehekin River ................................................................................... 25 5.2.2 Park Creek ................................................................................................................ 28 5.2.3 Flat Creek ................................................................................................................. 28 5.2.4 Bridge Creek ............................................................................................................ 30 5.2.5 North Fork Bridge Creek ......................................................................................... 32 5.2.6 South Fork Bridge Creek ......................................................................................... 33 5.2.7 Maple Creek ............................................................................................................. 35 5.2.8 McAlester Creek ...................................................................................................... 35 5.2.9 Rainbow Creek......................................................................................................... 39 5.2.10 Boulder Creek ........................................................................................................ 42 5.3 Stehekin River Watershed Landslide Inventory ..................................................................... 43 6 - Future Work ............................................................................................................................. 45 6.1 Progress Report ....................................................................................................................... 45 iv 7 - Literature Cited ........................................................................................................................ 47 Appendix A. Landslide Inventory for the Stehekin River Watershed .......................................... 51 v Figures Page Figure 1. Map showing the location of
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