FEMA puts Riverton Township’s expected hazard damage per building below that of 97% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Riverton Township gets an A+ for hazard risk: lower expected damage per building than 97% of U.S. towns. Most of that expected damage is river and rain flooding (89%). Flood insurance has paid 2 claims here since 1986.
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 Township 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
Strong wind
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 Township’s grade
River and rain flooding is 89% of the building damage FEMA expects in Riverton Township, and Riverton Township’s rate of river and rain flooding damage is lower than 78% of U.S. census tracts. Next is strong wind at 6% (higher than 87% of U.S. census tracts).
A+ lower expected damage per building than 97% of U.S. towns (21,298).
All of Riverton Township’s residents live in one census tract; the figures are that tract’s.
In dollars, FEMA expects about $288K a year in losses across Riverton Township: $219K to buildings, the rest to people and crops.
Does Riverton Township flood? Rarely: 2 flood claims since 1986
Every paid claim on a federal flood insurance policy in Riverton Township, from FEMA’s records: 3.8 per 1,000 homes, more than 54% of the 13,809 U.S. towns with a flood insurance record.
Riverton Township isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Mason County.The storms Riverton Township remembers
None of the 6 disasters declared for Mason County shows FEMA aid or repair money reaching Riverton Township itself in FEMA’s records, so these are its biggest flood-claim years.
- 19862 flood claims paidThe year of Severe Storms and Flooding, declared for Mason County
Mason County has had 6 natural disasters declared by the President since 1953, most often severe storms, then floods. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Riverton Township after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Riverton Township archive →Riverton Township and its neighbors
Riverton Township is 3rd of the 6 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Scottville | A+among the lowest damage | river and rain flooding | — |
| Amber Township | A+among the lowest damage | river and rain flooding | — |
| Riverton Township | A+less damage than 97% | river and rain flooding | 2 |
| Custer Township | A+less damage than 96% | river and rain flooding | — |
| Pere Marquette Township | A+less damage than 96% | river and rain flooding | 3 |
| Weare Township | Aless damage than 85% | river and rain flooding | 1 |
| Eden Township | — | 525 residents; we grade 1,000+ | |
| Summit Township | — | 977 residents; we grade 1,000+ | |
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 Township 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.
- Trim dead limbs over the house and driveway.
- Tie down trash cans and outdoor furniture.
- Stay clear of downed lines and call the utility.
- 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 Township
Is Riverton Township at risk for natural disasters?
On FEMA’s National Risk Index, Riverton Township has lower expected damage per building than 97% of U.S. towns: A+ for hazard risk. Most of the expected damage is river and rain flooding (89%) and strong wind (6%). The figures are for the one census tract the town shares with its neighbors. This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Riverton Township flood?
Flood insurance has paid 2 claims in Riverton Township since 1986, $20K in all, or 3.8 per 1,000 homes, more than 54% of U.S. towns with a flood insurance record.
Is Riverton Township 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 Mason County, 10% of homes in mapped flood zones carry federal flood insurance, and 0.3% of all homes do.
How much is flood insurance in Riverton Township?
FEMA’s Community Rating System list shows no discount for Riverton Township’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
Is Riverton Township at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (89%), and Riverton Township’s rate for it is lower than 78% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Riverton Township.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Riverton Township’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.