Lewiston Tithing Office and Granary · Photo: Tricia Simpson · CC BY-SA 3.0FEMA expects less hazard damage per building in Lewiston than in 77% of U.S. towns, led by earthquakes
On FEMA’s National Risk Index, Lewiston gets an A− for hazard risk: lower expected damage per building than 77% of U.S. towns. Most of that expected damage is earthquakes (49%), then river and rain flooding (43%). FEMA’s files show no paid flood insurance claims here.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What Lewiston faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
Earthquakes
River and rain flooding
Wildfire
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
What’s behind Lewiston’s grade
Earthquakes are 49% of the building damage FEMA expects in Lewiston, and Lewiston’s rate of earthquakes damage is higher than 85% of U.S. census tracts. Wildfire adds 6%, at a rate in the top 8% of U.S. census tracts.
A− lower expected damage per building than 77% of U.S. towns (21,298).
Lewiston’s residents live in 2 census tracts; FEMA’s figures are combined by where they live.
In dollars, FEMA expects about $2.5M a year in losses across Lewiston: $344K to buildings, the rest to people and crops.
Does Lewiston flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Lewiston. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Lewiston isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Cache County.The storms Lewiston remembers
None of the 4 disasters declared for Cache County shows FEMA aid or repair money reaching Lewiston itself in FEMA’s records, so these are its biggest flood-claim years.
Cache County has had 4 natural disasters declared by the President since 1953, most often floods, then severe storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Lewiston and its neighbors
Lewiston has the lowest expected damage per building of the 1 graded towns here. Tap a town to see its hazards.
Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.
Get ready for what Lewiston faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- 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.
- Clear dead leaves and brush within 5 feet of the house.
- Sign up for local alerts and know two ways out.
- Keep N95 masks for smoky days.
- 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.
Questions about natural hazards in Lewiston
Is Lewiston at risk for natural disasters?
On FEMA’s National Risk Index, Lewiston has lower expected damage per building than 77% of U.S. towns: A− for hazard risk. Most of the expected damage is earthquakes (49%) and river and rain flooding (43%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Lewiston in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Cache County, 6% of homes in mapped flood zones carry federal flood insurance, and 0.2% of all homes do.
How much is flood insurance in Lewiston?
FEMA’s Community Rating System list shows no discount for Lewiston’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
Is Lewiston at risk from earthquakes?
It is the largest share of the building damage FEMA expects here (49%), and Lewiston’s rate for it is higher than 85% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Lewiston.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Lewiston’s residents lived in the 2020 census; 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. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.