FEMA rates relative landslide risk for Multnomah County as very high and reports FEMA annualized frequency of 1.256 per year for the area.
FEMA summary
FEMA's profile for Multnomah County reports FEMA annualized frequency of 1.256 per year for landslide. FEMA's relative risk rating for the area is very high; the annualized frequency is a separate measure.
Hazard metrics cover FEMA county-equivalent geographies rather than individual addresses or parcels. Use local or state hazard maps before making a property, insurance, retrofit, or evacuation decision.
Select a hazard to inspect FEMA's figures for Multnomah County.
Landslide
FEMA combines its area-wide loss estimate and community data in this relative rating. Event frequency appears separately below.
Relative FEMA score
99.6/100
Occurrence thresholds vary by hazard. The FEMA methodology defines the value for each hazard.
The area loss estimate combines FEMA's modeled losses to buildings, population, and agriculture across Multnomah County. It is not an estimate for a home or address.
City risk summary
For Gresham, FEMA rates landslide risk for Multnomah County as very high, with a relative score of 99.6/100. The next highest relative scores are earthquake at 99.6/100 and volcanic activity at 91.0/100.
Using FEMA data for Multnomah County, Gresham is tied #2 among 8 covered Oregon entries for landslide risk; 2 entries share that score. Portland is about 10 straight-line miles from the Gresham map point and uses the same FEMA geography.
For homeowners and movers
Preparedness actions
Living in Gresham? Learn how to handle water storage, sanitation, and security in a small space.
The map shows Gresham. All FEMA figures on this page cover Multnomah County.
The FEMA figures cover Multnomah County. Address-level conditions require local maps, building records, and property details.
FEMA rates relative landslide risk for Multnomah County as very high. Its FEMA annualized frequency is 1.256 per year. Damage at a specific address also depends on the building, soil, elevation, and exact hazard zone.
Among 8 Oregon cities covered by this directory, Gresham is Tied #2 for relative landslide risk based on FEMA's score for Multnomah County. 2 covered cities share this rank because they use the same FEMA geography. Homes within Gresham can have different soil, elevation, construction, and hazard-zone conditions.
In FEMA's data for Multnomah County, the highest relative ratings are Landslide (Very High), Earthquake (Relatively High), and Volcanic Activity (Relatively High). FEMA uses estimated losses and community data along with event frequency when assigning these ratings.
The hazard numbers cover Multnomah County. For an individual home, check local fault, flood, fire, evacuation, and building records for the exact address.
FEMA gives Multnomah County an overall relative risk rating of relatively high. Conditions at a specific home depend on its hazard zones, building type, maintenance, insurance, and access to evacuation routes and emergency services.
Start with this step: Confirm the exact hazard using official local maps before making property or insurance decisions. Know how local officials issue warnings and evacuation instructions. Use Ready.gov Be Informed and local emergency guidance for a complete plan.
Distances are measured between city coordinates.
| City | Distance | Landslide rating | Relative score |
|---|---|---|---|
| Portland, OR | 10 mi | Very High | 99.6 |
| Vancouver, WA | 12 mi | Relatively High | 96.7 |
| Beaverton, OR | 18 mi | Relatively High | 96.8 |
| Hillsboro, OR | 24 mi | Relatively High | 96.8 |
| Salem, OR | 49 mi | Very High | 99.3 |
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View productHazard metrics come from FEMA National Risk Index v1.19.0 (March 2023). City population and coordinates come from SimpleMaps US Cities Database. For current conditions, use official local maps, warnings, inspections, and professional advice.