FEMA expects less hazard damage per building in Flat Rock than in 82% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Flat Rock gets an A− for hazard risk: lower expected damage per building than 82% of U.S. towns, #265 of 701 in Michigan. Most of that expected damage is river and rain flooding (84%). Flood insurance has paid 12 claims here since 1982.
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 Flat Rock 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
Tornadoes
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 Flat Rock’s grade
River and rain flooding is 84% of the building damage FEMA expects in Flat Rock, and Flat Rock’s rate of river and rain flooding damage is lower than 55% of U.S. census tracts. Next is tornadoes at 8% (higher than 54% of U.S. census tracts).
A− #265 of 701 in Michigan; lower expected damage per building than 82% of U.S. towns (21,298).
Flat Rock’s residents live in 3 census tracts; FEMA’s figures are combined by where they live.
The typical Michigan town has lower expected damage than 77% of U.S. towns; within the state, Flat Rock has less expected damage per building than 62% of Michigan towns.
In dollars, FEMA expects about $2.6M a year in losses across Flat Rock: $1.9M to buildings, the rest to people and crops.
Does Flat Rock flood? Sometimes: 12 flood claims since 1982
Every paid claim on a federal flood insurance policy in Flat Rock, from FEMA’s records: 2.9 per 1,000 homes, fewer than 53% of the 13,809 U.S. towns with a flood insurance record.
Flat Rock isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Wayne County.5 federal disasters brought FEMA money to Flat Rock
Disasters that paid out in Flat Rock itself (aid to households or repair grants to the City of Flat Rock), newest first, with that year’s flood claims.
- 2023Severe Storms, Tornadoes, and Flooding211 households applied for aid$327K aid approved5 flood claims paid that year
- 2021Severe Storms, Flooding, and Tornadoes28 households applied for aid$17K aid approved
- 2014Severe Storms and Flooding20 households applied for aid$17K aid approved
- 2004Severe Storms, Tornadoes, and Flooding4 households applied for aid$2K aid approved1 flood claim paid that year
- 1999Mi - Severe Weather 1/2 /99$6K to the City of Flat Rock for repairs
Wayne County has had 13 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 Flat Rock after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Flat Rock archive →Flat Rock and its neighbors
Flat Rock is 4th of the 7 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 |
|---|---|---|---|
| Huron Township | Aless damage than 88% | river and rain flooding | 4 |
| Brownstown Township | A−less damage than 84% | river and rain flooding | 65 |
| Rockwood | A−less damage than 83% | river and rain flooding | 25 |
| Flat Rock | A−less damage than 82% | river and rain flooding | 12 |
| Woodhaven | B+less damage than 72% | river and rain flooding | 3 |
| Berlin Township | B−more damage than 52% | river and rain flooding | 146 |
| South Rockwood | C+more damage than 56% | river and rain flooding | 4 |
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 Flat Rock 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.
- Pick your spot now: the lowest floor, an inside room, no windows.
- A watch means be ready; a warning means take cover now.
- Keep shoes and a flashlight by the bed.
- 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 Flat Rock
Is Flat Rock at risk for natural disasters?
On FEMA’s National Risk Index, Flat Rock has lower expected damage per building than 82% of U.S. towns: A− for hazard risk, #265 of 701 in Michigan. Most of the expected damage is river and rain flooding (84%) and tornadoes (8%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Flat Rock flood?
Flood insurance has paid 12 claims in Flat Rock since 1982, $68K in all, or 2.9 per 1,000 homes, fewer than 53% of U.S. towns with a flood insurance record.
Is Flat Rock 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 Wayne County, 22% of homes in mapped flood zones carry federal flood insurance, and 0.5% of all homes do.
How much is flood insurance in Flat Rock?
FEMA’s Community Rating System list shows no discount for Flat Rock’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Flat Rock?
By FEMA money that reached Flat Rock, Severe Storms, Tornadoes, and Flooding (2023): 211 households applied for aid, $327K approved.
Is Flat Rock at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (84%), and Flat Rock’s rate for it is lower than 55% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Flat Rock.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Flat Rock’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.