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Open-File Report O-11-16, Multi-Hazard and Risk Study for the Mount Hood Region, Multnomah, Clackamas, and Hood River Counties, Oregon, by William J. Burns, Kaleena L. B. Hughes, Keith V. Olson, Jason D. McClaughry, Katherine A. Mickelson, Daniel E. Coe, John T. English, Jed T. Roberts, Rachel R. Lyles Smith, and Ian P. Madin

Order publication DVD, $30, from Nature of the Northwest. DVD includes seven PDF map plates, text report PDF, Excel files.

"Hazards and Assets Viewer for Mount Hood" interactive web map

Mount Hood Multi-Hazards Risk Study fact sheet

The DVD publication includes the following:

1. Thematic map plates (actual size 55 in x 61 in; scale 1:72,000):
Plate 1. Study Area Map [preview]
Plate 2. Volcano Hazards [preview]
Plate 3. Landslide Hazards [preview]
Plate 4. Flood and Channel Migration Hazards [preview]
Plate 5. Earthquake Hazards [preview]
Plate 6. Generalized Land Use/Zoning [preview]
Plate 7. Gridded 2000 U.S. Census Population [preview]

Click on plate image to preview.

Plate 1
Plate 1. Study Area Map [preview]

Plate 2
Plate 2. Volcano Hazards [preview]

Plate 3
Plate 3. Landslide Hazards [preview]

Plate 4
Plate 4. Flood and Channel Migration Hazards [preview]
Plate 5
Plate 5. Earthquake Hazards [preview]
Plate 6
Plate 6. Generalized Land Use/Zoning [preview]
Plate 7
Plate 7. Gridded 2000 U.S. Census Population [preview]

2. Report:
Text report to accompany plates (PDF file) is provided in two resolutions: *_print.pdf files are best for plotting; *_onscreen.pdf files are best for onscreen viewing. To view Adobe Acrobat portable document format (.pdf) files, download the free Adobe Acrobat Reader from Adobe Systems Inc., San Jose, CA. http://www.adobe.com

3. Appendices:

Appendix A. Stakeholder Survey (PDF file)

Appendix B. ShakeMap Background Information (PDF files)

Appendix C. Spreadsheets of inventory and exposure tables (as PDF and as Microsoft Excel files):

Appendix D. HAZUS Reports - Five HAZUS-MH reports for the study area (PDF files):

Appendix E. Stakeholder Meeting Posters (PDF files)

 

About this publication

Mt. Hood, a potentially active volcano in north-central Oregon, poses significant volcano, landslide, flood, channel migration, and earthquake hazards to nearby communities and to the Portland, Oregon, metropolitan area. Community assets (for example, people, roads, buildings, dams, and electrical systems) around the volcano are at risk from these hazards.

The purpose of this study is to assist communities on and near Mt. Hood to become more resilient to geologic hazards by identifying and mapping the hazards and the community assets in the study area and by performing exposure and risk analysis. A second purpose is to explore hazard and risk analysis methodologies that can be applied to other volcanic areas.

Hazards and community assets were identified through stakeholder input, reviews of existing data, and mitigation plans. The final data layers were created through compilation and/or creation of new data. The hazards mapped include volcano, landslide, flood, and earthquake. The assets mapped include critical facilities and primary infrastructure, generalized land use/zoning and buildings, and population. The report summarizes the methodologies used and presents detailed results of the risk analysis. Seven plates provide thematic map views of hazards and assets. An interactive web map (http://www.oregongeology.org/mthood/) also provides a way to access this information.

The study area is approximately 526 square miles (1,363 square kilometers). Primary roads in the area are U.S. Interstate 84, U.S. Highway 26, and state routes 35 and 281. The primary hydrologic drainages in the area are Hood River; West, Middle, and East Forks of Hood River; and the Sandy River. Cities and/or communities include Hood River, Odell, The Villages at Mt. Hood, Damascus, Gresham, Fairview, Troutdale, Wood Village, and Sandy as well as unincorporated areas in Multnomah, Clackamas, and Hood River counties.

This study was conducted January 2010 through mid September 2011 with funding through U.S. Geological Survey Award G10AC00029, “Multi-Hazard Risk and Vulnerability Assessments at Select Drainages Around Mount Hood (OR) Using Methodologies That Would Be Applicable to Other Volcanic Areas.”

In September 2009 the U.S. Geological Survey (USGS) Cascades Volcanic Observatory (CVO) solicited proposals to use funds from the American Recovery and Restoration Act (ARRA) for a multi-hazard study of the Mount Hood area (study area extent: Plate 1 [preview]). The Oregon Department of Geology and Mineral Industries (DOGAMI) submitted a proposal entitled “Multi-hazard risk and vulnerability assessments at select drainages around Mount Hood (OR) using methodologies that would be applicable to other volcanic areas.” That proposal was accepted and this project was funded through USGS Award Number G10AC00029. This study was completed between January 2010 and September 2011.

The main purpose of this project was to help communities on or near Mount Hood become more resilient to geologic hazards by providing accurate, detailed, and up-to-date information about hazards and about community assets at risk. A second purpose was to explore hazard and risk analysis methodologies that could be applied to other volcanic areas.

The main objectives of this study were to:

The first task was to acquire input from stakeholders regarding hazard, asset, and risk analysis needs through a series of workshops and a pre-workshop poll. The two most significant results from the poll and workshops were the importance of infrastructure and the desire to have study data provided online (http://www.oregongeology.org/mthood/).

The second task was to create a Geographic Information System (GIS) database of hazards and a GIS database of community assets. The databases, which include both complied data and data created for this project, are:

Learn more about these hazards and assets (on the "Hazards and Assets Viewer for Mount Hood" web site).

We believe that these databases are the most complete and accurate currently available; most have been created or updated using new high-resolution, high-accuracy lidar topographic data. Newly mapped or modeled results include newly modeled lahar hazard zones, almost 400 large, deep-seated landslides, over 1,000 debris flow fan areas, channel migration hazard zones, a gridded population density data, almost 47,000 buildings, 104 school and emergency response facilities, over 1,600 miles of road, 340 bridges, 944 primary electric transmission towers, and 615 miles of electric transmission lines.

We used these databases to perform hazard and asset exposure analysis and HAZUS-MH based risk analysis. There are approximately 5,000 people located in the 500-year volcano hazard zones, which is important information for evacuation planning. We also estimated that 20% of the highway miles in Hood River County are exposed to debris flow hazards.