Oregon 2015 Natural Hazards Mitigation Plan

The Oregon Natural Hazards Mitigation Plan (NHMP) identifies Oregon’s natural hazards and their probability, the state’s vulnerabilities, its mitigation strategies, and prioritized actions to reduce vulnerability to natural hazards. The plan includes the results from a state-wide risk assessment, regional risk assessments for eight regions in Oregon, a mitigation strategy, and an “enhanced” plan. The Risk Assessment introduces how the state is impacted by climate change, and how climate change is predicted to impact each hazard statewide. The current version of the plan was approved on September 24, 2015 as an Enhanced Plan, and is effective through September 23, 2020.

A section of the report is devoted to describing the effects of climate change on Oregon. Climate change is understood as significantly affecting the frequency and magnitude of many natural hazards and hazard events. Climate impacts as detailed for the state include increased overall average temperature, snowpack decline in the Cascade Mountains, and higher temperatures causing earlier spring snowmelt and spring peak streamflows. In addition, coastal flooding and erosion is increasing with sea level rise; wildfire has been significantly impacting Oregon’s forests; and, a three-fold increase in heat-related illness has been documented in Oregon with each 10?F rise in daily maximum temperature. The Risk Assessment provides a summary of the principal effects of changing climate conditions on the natural hazards addressed in the Oregon NHMP.

The natural hazards addressed in the report include:

  • Coastal Hazards
  • Droughts
  • Dust Storms
  • Earthquakes
  • Floods
  • Landslides
  • Tsunamis
  • Volcanoes
  • Wildfires
  • Windstorms
  • Winter Storms

In addition, climate change is recognized throughout the plan as a compounding factor that may influence the frequency and severity of some of these natural hazards.  The anticipated impact climate change will have on each hazard is described.

The plan also contains Regional Profiles - with natural hazards also assessed at the regional level of vulnerability.  The eight Oregon NHMP Natural Hazard Regions are the: Oregon Coast, North Willamette Valley/Portland Metro, Mid/Southern Willamette Vally, Southwest Oregon, Mid-Columbia Region, Central Oregon, Northeast Oregon, and Southeast Oregon. Each Regional Risk Assessment includes descriptions of the natural environment, demographics, economy, infrastructure, and built environment - highlighting potential vulnerabilities to natural hazard events.


Publication Date: September 24, 2015

Related Organizations:

  • State of Oregon


Resource Category:

Resource Types:

  • Plans (other)

States Affected:


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