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Project Background

Purpose
Publication
Acknowledgments and Funding
Map Viewer Development

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Purpose

hazards assets risk diagram

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.

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.

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.

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Publication

The results of the study are available as DOGAMI Open-File Report O-11-16 [preview; order publication DVD], 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. Study results are also displayed on an interactive web map (Hazards and Assets Map Viewer). Users can browse or can fly to a community or an address, then select the full range of asset and hazard data for viewing. A Help page explains the map viewer interface.

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]

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)

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Acknowledgments and Funding

The publication is the result of a proposal titled “Multi-Hazard Risk and Vulnerability Assessments at Select Drainages Around Mount Hood (OR) Using Methodologies That Would Be Applicable to Other Volcanic Areas.“ Funding for this project was provided by the U.S. Geological Survey Cascade Volcanic Observatory (CVO) through an ARRA grant(USGS Award Number G10AC00029), with some funds from the State of Oregon. We are very grateful to individuals from CVO and the Mount Hood National Forest who assisted us with data compilation and discussions. We would also like to thank all the people from city and county agencies and departments who assisted us with data compilation, attended workshops, completed the poll, and participated in discussion.

We thank people from other agencies who assisted on this project — from the U.S. Geological Survey, Cascades Volcano Observatory: Cynthia Gardner, Willie Scott, Tom Pierson, Carolyn Driedger, Dick Iverson, Steve Schilling, Julie Griswold, John Ewert, Seth Moran, and Evelyn Roeloffs; and from U.S.D.A. Forest Service, Mount Hood National Forest: Tom DeRoo.

DOGAMI MAP DATA CREATION/DEVELOPMENT
Lidar: John T. English, Kaleena L.B. Hughes, Jed T. Roberts, Paul Ferro
Building Footprints: Kaleena L.B. Hughes, Keith V. Olson, Robert D. Chappell
Infrastructure Asset Data: Keith V. Olson, Kaleena L.B. Hughes
Volcano Hazards: William J. Burns
Landslide Hazards: William J. Burns, Katherine A. Mickelson
Flood Hazards: Daniel E. Coe, Kaleena L.B. Hughes, John T. English, Jed T. Roberts
Channel Migration Zones: Daniel E. Coe, John T. English, Robert D. Chappell
Earthquake Hazards: Ian P. Madin, William J. Burns, Kaleena L.B. Hughes, Rachel R. Lyles Smith
Gridded Population Analysis: Kaleena L.B. Hughes
Generalized Land Use/Zoning Analysis: Kaleena L.B. Hughes, William J . Burns

DOGAMI MAP PLATE PRODUCTION
Cartography: Rachel R. Lyles Smith
Text: William J . Burns, Ian P. Madin
Editing: Ian P. Madin

DOGAMI WEB MAP VIEWER CREATION/DEVELOPMENT
Lidar base map: Paul Ferro
ArcViewer for Flex development: Paul Ferro
Web map cartography: Kaleena L.B. Hughes

Map Viewer Version History

Study completed and released as DOGAMI Open-File Report O-11-16. Hazards and Assets Map Viewer deployed using Esri ArcGIS Server and ArcGIS Viewer for Flex version 2.3.1.