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DOGAMI Interpretive Map 57, Landslide Hazard and Risk Study Of Landslide Hazard and Risk Study of Central and Western Multnomah County, Oregon Cover page: Landslide risk and hazards for a portion of the study area. Layers from top to bottom: Assets (buildings and transportation routes), landslide inventory, shallow landslide susceptibility, and deep landslide susceptibility. Oregon Department of Geology and Mineral Industries Interpretive Map 57 State of Oregon Oregon Department of Geology and Mineral Industries Brad Avy, State Geologist INTERPRETIVE MAP 57 LANDSLIDE HAZARD AND RISK STUDY OF CENTRAL AND WESTERN MULTNOMAH COUNTY, OREGON by William J. Burns1, Nancy C. Calhoun1, Jon J. Franczyk1, Kassandra O. Lindsey2, and Lina Ma1 2018 1Oregon Department of Geology and Mineral Industries, 800 NE Oregon Street, Suite 965, Portland, OR 97232 2Colorado Geological Survey, 1801 19th Street, Golden, CO 80401 Landslide Hazard and Risk Study of Central and Western Multnomah County, Oregon DISCLAIMER This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. This publication cannot substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from the results shown in the publication. Oregon Department of Geology and Mineral Industries Interpretive Map 57 Published in conformance with ORS 516.030 For additional information: Administrative Offices 800 NE Oregon Street, Suite 965 Portland, OR 97232 Telephone 971-673-1555 http://www.oregongeology.org http://www.oregon.gov/DOGAMI/ Oregon Department of Geology and Mineral Industries Interpretive Map 57 ii Landslide Hazard and Risk Study of Central and Western Multnomah County, Oregon LIST OF FIGURES Figure 2-1. Map of the study area ................................................................................................................................. 2 Figure 2-2. Map of risk reporting areas/communities in the study area ....................................................................... 3 Figure 2-3. Recently completed landslide hazard and risk analysis projects (pink areas) near the study area ............. 5 Figure 2-4. Map of generalized bedrock engineering geology in the study area .......................................................... 7 Figure 2-5. Map of generalized surficial engineering geology in the study area ........................................................... 9 Figure 3-1. Input datasets and results ......................................................................................................................... 12 Figure 3-2. Dasymetric population distribution map input data and result examples ................................................ 19 Figure 3-3. Map of the 1,806 preliminary historic landslide points (red dots) recorded for the period 1928– 2016 ........................................................................................................................................................... 22 Figure 3-4. Map showing locations of the 457 preliminary historic landslide points from the 1996 event that have landslide length and width data ........................................................................................................ 23 Figure 3-5. Schematic showing the difference in landslide exposure value for landslide point (solid black dot) data versus landslide polygon (hashed rectangle) data in the same parcel. ............................................. 24 Figure 3-6. Map of the 171 census tracts used in Hazus analysis, risk reporting areas/community boundaries, and study area ........................................................................................................................................... 25 Figure 3-7. Chart of all preliminary historic landslide points in the City of Portland ................................................... 26 Figure 4-1. Map of channelized debris flow fans in the study area ............................................................................. 30 Figure 5-1. Landslide risk management diagram ......................................................................................................... 36 LIST OF TABLES Table 3-1. Summary of geotechnical material properties for primary surficial geologic engineering units .............. 15 Table 3-2. Landslide susceptibility of geologic groups ............................................................................................... 17 Table 3-3. Communities for exposure reporting ........................................................................................................ 22 Table 3-4. Summary of annualized loss estimates (2016 dollar values) ..................................................................... 27 Table 4-1. Summary of landslide inventories for each community ............................................................................ 28 Table 4-2. Summary of shallow landslide susceptibility by community ..................................................................... 29 Table 4-3. Summary of deep landslide susceptibility by community ......................................................................... 31 Table 4-4. Summary of the exposure of select assets to three existing landslide types ............................................ 32 Table 4-5. Summary of exposure of select assets to shallow and deep landslide susceptibility zones ...................... 33 Table 4-6. Summary of Hazus analysis results for the Cascadia Subduction Zone M9.0 earthquake scenario: building dollar values ................................................................................................................................. 34 LIST OF PLATES Plate 1. Landslide inventory map of central and western Multnomah County, Oregon Plate 2. Shallow landslide susceptibility map of central and western Multnomah County, Oregon Plate 3. Deep landslide susceptibility map of central and western Multnomah County, Oregon APPENDICES Appendix A. Historic Landslide Inventory Methodology Appendix B. Exposure Analysis Results (Microsoft® Excel® Spreadsheet) Appendix C. Hazus Analysis Results Oregon Department of Geology and Mineral Industries Interpretive Map 57 iii Landslide Hazard and Risk Study of Central and Western Multnomah County, Oregon GEOGRAPHIC INFORMATION SYSTEM (GIS) DATA See the digital publication folder for files. Geodatabase is Esri® version 10.1 format. Metadata is embedded in the geodatabase and is also provided as separate .xml format files. Multnomah_Landslide_Inventory.gdb: feature classes: Deep_LS_Susceptibility (polygons) Deposits (polygons) Historic_LS_Points (points) Scarps (polylines) Scarps_Flanks (polygons) Shallow_LS_Susceptiblity (raster) Metadata in .xml file format: Deep_LS_Susceptibility.xlsm Deposits.xlsm Historic_LS_Points.xlsm Scarps.xlsm Scarps_Flanks.xlsm Shallow_LS_Susceptibility.xlsm Oregon Department of Geology and Mineral Industries Interpretive Map 57 iv Landslide Hazard and Risk Study of Central and Western Multnomah County, Oregon 1.0 REPORT SUMMARY At least 1,700 landslides have occurred within the City of Portland during the last 90 years (1928–2016). Of these landslides, approximately 830 occurred during the severe storms in 1996. From these historical data, we estimate an average of 20 landslides per year in the City of Portland. We estimate annual loss from landslides in the City of Portland ranges from $1.5M (million) to $3M. In years with extreme winter storms, this estimate can increase to approximately $64M to $81M. These historical data are a clear indi- cation of a significant landslide risk and thus the need for continued landslide risk reduction. In 2014, the Oregon Department of Geology and Mineral Industries (DOGAMI) submitted a grant ap- plication to Federal Emergency Management Agency (FEMA) and was granted funding to perform this study. The majority of the work on this project took place during 2015-2016. The purpose of the project was to assist the communities in the study area to better understand the landslide hazard and risk and to continue landslide risk reduction. Deliverables of the study include: • This report text, appendices, and map plates • Geographic Information System (GIS) datasets including: o landslide inventory—map of locations of landslides that have occurred at some time in the past o shallow landslide susceptibility—map of areas prone (low, moderate, high) to future shal- low landslides o deep landslide susceptibility—map of areas prone (low, moderate, high) to future deep landslides o Landside risk analysis The study area includes the Cities of Portland, Gresham, Fairview, Wood Village, Troutdale, and por- tions of Multnomah County and covers approximately 300 square miles. The city of Portland is divided into risk reporting areas roughly defined by the nine neighborhood coalitions. Nearly one quarter of the people living in Oregon (~4 million people), live in the study area (~724,000 people). These people live and work in approximately 230,000 buildings worth approximately $75 with an additional $45 in land value. First, we compiled existing detailed, lidar-based landslide inventories. ThBese data were created Band published during 2010–2012 by following the protocol of Burns and Madin (2009). Then, we updated the historical landslide inventory inside the City of Portland with data provided by the City.
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