Photo: Montgomery County Planning Commission · CC BY-SA 2.0FEMA puts Conshohocken’s expected hazard damage per building above that of 76% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Conshohocken gets a C− for hazard risk: higher expected damage per building than 76% of U.S. towns, #947 of 1,037 in Pennsylvania. Most of that expected damage is river and rain flooding (91%). Flood insurance has paid 106 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 Conshohocken’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Conshohocken 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 Conshohocken’s grade
River and rain flooding is 91% of the building damage FEMA expects in Conshohocken, and Conshohocken’s rate of river and rain flooding damage is higher than 88% of U.S. census tracts.
C− #947 of 1,037 in Pennsylvania; higher expected damage per building than 76% of U.S. towns (21,298).
Conshohocken’s residents live in 3 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, Conshohocken has more expected damage per building than 91% of Pennsylvania towns.
In dollars, FEMA expects about $6.6M a year in losses across Conshohocken: $3.8M to buildings, the rest to people and crops.
Does Conshohocken flood? Yes: 106 flood claims since 1978
Every paid claim on a federal flood insurance policy in Conshohocken, from FEMA’s records: 21.9 per 1,000 homes, more than 85% of the 13,809 U.S. towns with a flood insurance record.
- Hurricane Ida24 claims · $3.1M
- Hurricane Floyd12 claims · $1.6M
- Hurricane Irene10 claims · $190K
Conshohocken isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Montgomery County.6 federal disasters brought FEMA money to Conshohocken
Disasters that paid out in Conshohocken itself (aid to households or repair grants to the Borough of Conshohocken), newest first, with that year’s flood claims.
- 2021Remnants of Hurricane Ida182 households applied for aid$564K aid approved24 flood claims paid for it, $3.1M
- 2011Tropical Storm Lee10 households applied for aid$14K aid approved
- 2011Hurricane Irene54 households applied for aid$72K aid approved10 flood claims paid for it, $190K
- 2006Severe Storms, Flooding, and Mudslides3 households applied for aid$10K aid approved5 flood claims paid that year
- 2004Tropical Depression Ivan12 households applied for aid$27K aid approved
- 2004Severe Storms and Flooding5 households applied for aid$6K aid approved
Montgomery County has had 23 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 Conshohocken after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Conshohocken archive →Conshohocken and its neighbors
Conshohocken is 5th of the 5 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 |
|---|---|---|---|
| Lower Merion Township | B+less damage than 75% | river and rain flooding | 234 |
| Plymouth Township | B+less damage than 70% | river and rain flooding | 339 |
| Whitemarsh Township | Bless damage than 55% | river and rain flooding | 290 |
| West Conshohocken | Cmore damage than 66% | river and rain flooding | 11 |
| Conshohocken | C−more damage than 76% | river and rain flooding | 106 |
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 Conshohocken 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 Conshohocken
Is Conshohocken at risk for natural disasters?
On FEMA’s National Risk Index, Conshohocken has higher expected damage per building than 76% of U.S. towns: C− for hazard risk, #947 of 1,037 in Pennsylvania. Most of the expected damage is river and rain flooding (91%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Conshohocken flood?
Flood insurance has paid 106 claims in Conshohocken since 1978, $8.3M in all, or 21.9 per 1,000 homes, more than 85% of U.S. towns with a flood insurance record. 16 properties have flooded more than once. The most claims came from Hurricane Ida (24).
Is Conshohocken 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 Montgomery County, 47% of homes in mapped flood zones carry federal flood insurance, and 0.9% of all homes do.
How much is flood insurance in Conshohocken?
FEMA’s Community Rating System list shows no discount for Conshohocken’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 Conshohocken?
By FEMA money that reached Conshohocken, Remnants of Hurricane Ida (2021): 182 households applied for aid, $564K approved. By flood claims, Hurricane Ida: 24 paid, $3.1M.
Is Conshohocken at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (91%), and Conshohocken’s rate for it is higher than 88% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Conshohocken.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Conshohocken’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.