On FEMA’s figures, Castle Shannon faces less hazard damage per building than 82% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Castle Shannon gets an A− for hazard risk: lower expected damage per building than 82% of U.S. towns, #379 of 1,037 in Pennsylvania. Most of that expected damage is river and rain flooding (93%). Flood insurance has paid 30 claims here since 1978.
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 stands out about Castle Shannon’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Castle Shannon 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
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 Castle Shannon’s grade
River and rain flooding is 93% of the building damage FEMA expects in Castle Shannon, and Castle Shannon’s rate of river and rain flooding damage is lower than 51% of U.S. census tracts.
A− #379 of 1,037 in Pennsylvania; lower expected damage per building than 82% of U.S. towns (21,298).
Castle Shannon’s residents live in 2 census tracts; FEMA’s figures are combined by where they live.
The typical Pennsylvania town has lower expected damage than 71% of U.S. towns; within the state, Castle Shannon has less expected damage per building than 64% of Pennsylvania towns.
In dollars, FEMA expects about $1.4M a year in losses across Castle Shannon: $1.0M to buildings, the rest to people and crops.
Does Castle Shannon flood? Sometimes: 30 flood claims since 1978
Every paid claim on a federal flood insurance policy in Castle Shannon, from FEMA’s records: 7.3 per 1,000 homes, more than 68% of the 13,809 U.S. towns with a flood insurance record.
- Tropical Storm Ivan2 claims · $8K
Castle Shannon isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Allegheny County.1 federal disaster brought FEMA money to Castle Shannon
Disasters that paid out in Castle Shannon itself (aid to households or repair grants to the Borough of Castle Shannon), newest first, with that year’s flood claims.
- 2004Tropical Depression Ivan2 households applied for aid$6K aid approved2 flood claims paid for it, $8K
Allegheny County has had 15 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 Castle Shannon after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Castle Shannon archive →Castle Shannon and its neighbors
Castle Shannon is 5th 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 |
|---|---|---|---|
| Mount Lebanon | A+less damage than 98% | river and rain flooding | 12 |
| Bethel Park | A+less damage than 98% | river and rain flooding | 70 |
| Whitehall | A+less damage than 96% | river and rain flooding | 7 |
| Baldwin Township | A−less damage than 85% | river and rain flooding | 3 |
| Castle Shannon | A−less damage than 82% | river and rain flooding | 30 |
| Pittsburgh | Cmore damage than 69% | river and rain flooding | 447 |
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 Castle Shannon 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.
- 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 Castle Shannon
Is Castle Shannon at risk for natural disasters?
On FEMA’s National Risk Index, Castle Shannon has lower expected damage per building than 82% of U.S. towns: A− for hazard risk, #379 of 1,037 in Pennsylvania. Most of the expected damage is river and rain flooding (93%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Castle Shannon flood?
Flood insurance has paid 30 claims in Castle Shannon since 1978, $521K in all, or 7.3 per 1,000 homes, more than 68% of U.S. towns with a flood insurance record. 4 properties have flooded more than once. The most claims came from Tropical Storm Ivan (2).
Is Castle Shannon 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 Allegheny County, 28% of homes in mapped flood zones carry federal flood insurance, and 0.4% of all homes do.
How much is flood insurance in Castle Shannon?
FEMA’s Community Rating System list shows no discount for Castle Shannon’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 Castle Shannon?
By FEMA money that reached Castle Shannon, Tropical Depression Ivan (2004): 2 households applied for aid, $6K approved. By flood claims, Tropical Storm Ivan: 2 paid, $8K.
Is Castle Shannon at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (93%), and Castle Shannon’s rate for it is lower than 51% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Castle Shannon.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Castle Shannon’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.