Johnson’s biggest natural hazard is inland flooding
Most of the natural-hazard damage FEMA expects in Johnson comes from inland flooding, and overall the risk is low for a U.S. community.
What stands out about Johnson’s weather risks
Read from FEMA’s records below. The page puts what stands out first.
How exposed is Johnson?
FEMA expects yearly storm and flood damage to homes and buildings here to be higher than in 34% of U.S. communities, mostly from inland flooding and earthquakes.
Calmer than 401 of the 425 Oregon towns we cover.
Johnson is smaller than a census tract, so it shares the figures of the tract around its center.
Does Johnson flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Johnson. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Johnson isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Clackamas County.What Johnson faces
Each hazard’s share of the damage FEMA expects here, and how it compares with the rest of the country.
Inland flooding
Earthquakes
Cold waves
Heat waves
Federal disasters declared here
None of the disasters declared for Clackamas County shows FEMA aid or repair money reaching Johnson itself in FEMA’s records.
Clackamas County has had 18 natural disasters declared since 1953, most often severe storms and floods.
Get ready for what Johnson actually faces
A short kit for its top hazards, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- Let faucets drip so pipes don’t freeze.
- Know where your water shutoff is.
- Never heat the house with the oven or a grill.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Most disasters here begin in December–February
The month each of Clackamas County’s 18 declared disasters began, since 1953.
What these numbers can and can’t tell you
- An average, not a forecast. FEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.
- Compared by rate. “Higher than N%” compares yearly damage as a share of what’s there, so a big city isn’t rated riskier just for having more buildings.
- Money that reached town. Flood claims are matched to Johnson’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Johnson.
- It follows property value. FEMA’s model weighs damage to buildings, so a place that recently lost many homes can rate lower than it feels.
Storm stories
Memories, warnings and help from neighbors in Johnson.
Your answer becomes a post in Town Square.
Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau. Preparedness tips: Ready.gov. An average of past damage, not a forecast.