Potential Impact of a Major Earthquake on Emergency Transportation Routes in Clackamas, Multnomah, and Washington Counties, Oregon

Oregon Department of Geology and Mineral Industries 2018 Potential Impact of a Major Earthquake on Emergency Transportation Routes in Clackamas, Multnomah, and Washington Counties, Oregon vector digital data Oregon Department of Geology and Mineral Industries Open-File Report Open-File Report O-18-02 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries http://www.oregongeology.org Oregon Department of Geology and Mineral Industries 2018 Earthquake regional impact analysis for Clackamas, Multnomah, and Washington Counties, Oregon file geodatabase Oregon Department of Geology and Mineral Industries Open-File Report Open-File Report O-18-02 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries http://www.oregongeology.org/ Portland Urban Area Emergency Transportation Routes (2005) are generalized into a polygon-based segment/node model, overlain on permanent ground deformation data from a major earthquake, and categorized based on the maximum amount of ground failure the segment may experience at any portion along its length. The model assumes the segment is impassable if any portion of the road segment experiences ground failure. Ground failure is not guaranteed, however, as the Hazus ground failure model provides both an amount of ground failure (lateral spread) and a probability of failure. Quantify potential impact of a major earthquake on the Emergency Transportation Network (2005) in the Portland Urban Area. Limited to surface transportation. Does not contain any information on bridges, overpasses, or culverts. 2018 Complete None planned -123.361862 -121.694426 45.809536 45.045343 ISO 19115 Topic Category geoscientificinformation transportation Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus OR route Evacuation routes Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus Clackamas Multnomah Washington Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus Hardscape Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus None REPORT DATA: 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. See the accompanying text report for more details on the limitations of the methods and data used to prepare this publication. Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965

Portland Oregon 97232 USA 1 971 673 1555 1 971 673 1562 dogami-info@oregon.gov When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org John Bauer Oregon Department of Geology and Mineral Industries Geohazards Analyst jpeg image (.jpg) This work was funded on behalf of Regional Disaster Preparedness Organization with an Urban Area Security Initiative grant for the Portland Metropolitan Region. Unclassified Categories were based on overlay with generalized ground failure data, and should fully represent the maximum potential amount of ground failure the segment may experience for a given earthquake scenario. See metadata on ground failure data itself to fully ascertain the accuracy of the underlying ground failure data. No known problems. All segments are populated with legitimate valued defined by the Domain RoadSegCat All attributes fully specified, all segments described fully. Road network and the analysis stops at study area (county) boundary. Linear data were buffered as-is. No statement on original dataset HPA was given, though cursory inspection relative to lidar-derived bare earth hillshade suggests the digitized center-of-road was typically well within 20 feet of actual center-of-road. Not applicable Regional Emergency Management Technical Committee: Emergency Transportation Route Subcommittee 2005 Emergency Transportation Routes for the Portland Urban Area (2005) vector digital data Portland, Oregon Metro Data Resource Center From the five county MOU July 2005, ODOT No. 21,273. http://www.caloes.ca.gov/AccessFunctionalNeedsSite/Documents/21273-ETR%20MASTER-ODOT-FNL-cln-13jul05.pdf 2005 Linear features were buffered by 50 feet and fully dissolved. We then manually divided the polygon road network into a segment/node model, with any intersection being a node. Occasionally, complex intersections were treated as a single entity. Small segments were occasionally combined into a single segment, to avoid over-fragmenting the network and providing more meaningful data on the road segment. For the wet scenarios, we took the maximum ground failure (published with this report) from the liquefaction and earthquake-induced landslide datasets. For the dry scenario, only the earthquake-induced landslide ground failure dataset was used. We then generalized the ground failure data, following the methods outlined in the accompanying report, in order to better capture ground failure proximal to the road. Zonal statistics (as table) were then gathered on each road segment, and the road segments then categorized per the RoadSegCat domain bins. Visual inspection relative to the underlying ground failure data was then performed to assure correct assignment. Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965