Disaster Preparedness

Natural Disaster Types in Columbia County, Oregon

Columbia County, Oregon, faces a range of natural hazards, both from Oregon’s statewide hazard profile and from local risk assessments. The Oregon Department of Land Conservation and Development identifies six common natural hazards statewide: floods, landslides, earthquakes, tsunamis, coastal erosion, and wildfires (Oregon.gov). Additional hazards recognized in the state plan include droughts, dust storms, volcanoes, windstorms, and winter storms (Oregon.gov).

Hazard Types in Columbia County

Based on the Columbia County Natural Hazard Mitigation Plan and (www.augurisk.com) risk assessments, the county’s primary natural disaster types include:

• Earthquakes – High risk score (60.34%) due to proximity to active fault zones and the 2% probability, 50-year horizon seismic hazard model (www.augurisk.com).
• Floods – Coastal flooding risk is significant, with 14.51% of blocks potentially exposed to coastal flooding, influenced by sea level rise and storm events (www.augurisk.com).
• Wildfires – Moderate risk (27.24%), linked to summer temperature increases and wildfire hazard potential (www.augurisk.com).
• Severe Storms – Included in the county’s mitigation plan, though Augurisk’s storm event risk score is low (1.2%) (www.augurisk.com).
• Coastal Hazards – Coastal erosion and flooding are key concerns, especially in low-lying areas (Oregon.gov).
• Winter Storms – Recognized in the state hazard list; while Augurisk’s score is low, they can still impact infrastructure and travel (Oregon.gov).

Planning and Mitigation

Columbia County's Mitigation Plan addresses these hazards to reduce impacts on lives, property, and infrastructure. The plan includes:

• Earthquake preparedness for critical facilities.
• Floodplain management and coastal erosion control.
• Wildfire prevention through forest management and fuel reduction.
• Severe storm resilience measures for infrastructure.

Summary

In Columbia County, the most significant natural disaster types are earthquakes, coastal flooding, and wildfires, with severe storms, winter storms, and landslides also present in the hazard profile. Coastal hazards are especially relevant due to the county’s proximity to the Pacific Ocean and the Willamette River.