Photo: Vasiliymeshko · CC BY-SA 4.0Less hazard damage per building is expected in Riverton than in 80% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Riverton gets an A− for hazard risk: lower expected damage per building than 80% of U.S. towns, #6 of 28 in Wyoming. Most of that expected damage is river and rain flooding (65%), then earthquakes (30%). 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 Riverton faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
River and rain flooding
Earthquakes
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 Riverton’s grade
River and rain flooding is 65% of the building damage FEMA expects in Riverton, and Riverton’s rate of river and rain flooding damage is lower than 73% of U.S. census tracts. Next is earthquakes at 30% (higher than 81% of U.S. census tracts).
A− #6 of 28 in Wyoming; lower expected damage per building than 80% of U.S. towns (21,298).
Riverton’s residents live in 6 census tracts; FEMA’s figures are combined by where they live.
The typical Wyoming town has lower expected damage than 55% of U.S. towns; within the state, Riverton has less expected damage per building than 81% of Wyoming towns.
In dollars, FEMA expects about $3.2M a year in losses across Riverton: $2.1M to buildings, the rest to people and crops.
Does Riverton flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Riverton. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Riverton isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Fremont County.The storms Riverton remembers
None of the 3 disasters declared for Fremont County shows FEMA aid or repair money reaching Riverton itself in FEMA’s records, so these are its biggest flood-claim years.
Fremont County has had 3 natural disasters declared by the President since 1953, most often floods, then severe storms.
Also 1 FEMA wildfire suppression grant (Fire Management Assistance, not a disaster declaration) for fires in Fremont County, 2016–2016.
Riverton and its neighbors
Riverton has the lowest expected damage per building of the 2 graded towns here. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Riverton | A−less damage than 80% | river and rain flooding | 0 |
| Arapahoe | Cmore damage than 67% | river and rain flooding | — |
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 Riverton faces
A short kit for the hazards that drive the building damage here, 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.
- 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 Riverton
Is Riverton at risk for natural disasters?
On FEMA’s National Risk Index, Riverton has lower expected damage per building than 80% of U.S. towns: A− for hazard risk, #6 of 28 in Wyoming. Most of the expected damage is river and rain flooding (65%) and earthquakes (30%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Riverton 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 Fremont County, 14% of homes in mapped flood zones carry federal flood insurance, and 0.2% of all homes do.
How much is flood insurance in Riverton?
FEMA’s Community Rating System list shows no discount for Riverton’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
Is Riverton at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (65%), and Riverton’s rate for it is lower than 73% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Riverton.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Riverton’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.