How do I find out if I live in a dam inundation zone?

Contact your county emergency management office or state dam safety program to ask whether your home falls within a dam's inundation zone and to get the local evacuation plan. FEMA notes that this is the buyer's responsibility to check before purchasing property, so it is worth confirming even in a home you already own.

How much warning do you get before a dam failure?

It varies widely and can be very short. Some failures develop over hours, but others progress in minutes once a breach starts. Communities in inundation zones often rely on sirens, reverse-911 calls, or wireless emergency alerts, so knowing your evacuation route in advance matters more than waiting to judge the situation yourself.

Does my homeowner's insurance cover dam failure flooding?

Standard homeowner and renter policies do not cover flooding, including flooding caused by a dam failure. A separate National Flood Insurance Program policy is typically required, and it takes about 30 days to go into effect, so this is a decision to make well before a storm is forecast.

How many dams in the U.S. could cause loss of life if they failed?

FEMA's National Inventory of Dams classifies roughly 15,600 dams in the United States as high-hazard potential, meaning their failure could result in loss of life. This classification reflects what is downstream, not necessarily the current condition of the dam itself.

Is it safe to drive through water after a dam failure warning?

No. As little as 6 inches of fast-moving water can knock a person off their feet, and 12 inches can carry away most vehicles. Never drive, walk, or swim through moving floodwater, and turn around rather than crossing a flooded road.

Dam Failure Preparedness Checklist — Before, During & After

Phase 1

Before a dam failure. Know your zone before you need to.

Most communities downstream of a dam never experience a failure. But for the households that sit in an inundation zone, knowing the evacuation plan ahead of time is what turns a short warning into enough time.

Home Protection

Know your dam inundation zone and the evacuation plan for it. Contact your county emergency management office to check

Evacuation

Pack a 72-hour bag for each person in your household: medication, a change of clothes, document copies, water, and a phone charger
Identify your household meeting point and one out-of-area contact
Map two evacuation routes toward higher ground and drive them before you need them
Check your vehicle fuel level right now. Keep the tank at least half full so you can leave immediately

Communications

Turn on Wireless Emergency Alerts on every phone in your household
Get a battery-powered or hand-crank NOAA weather radio for when cell service fails
Learn how your community notifies residents of a dam incident: sirens, phone calls, or wireless alerts

Documents and Insurance

Get a waterproof, fireproof container for document copies, plus password-protected digital backups
Make a photo or video walkthrough of your home and belongings, stored in the cloud
Confirm flood coverage. Standard homeowner policies exclude flooding, and NFIP policies take about 30 days to take effect

Water

Store 1 gallon per person per day for at least 3 days, including pets

Food

Build a 3-day supply of shelf-stable food per person that needs no cooking

Power and Lighting

Get LED lanterns or flashlights for every main room
Get a power bank for each phone in your household

Medical

Get a complete first aid kit and check expiration dates yearly

Phase 2

During a dam failure. Move at the first warning.

Warning time for a dam incident can be very short. Moving as soon as you get a notification, rather than waiting to see water, is what the evacuation plan is built around.

If You Get a Warning

Move to higher ground immediately after a warning, siren, or notification call. Do not wait to see water before you move
Follow evacuation routes and instructions from local officials rather than your own judgment about timing
Take your 72-hour bag and documents if there is time. Leave immediately if there is not

Floodwater Safety

Never walk, swim, or drive through floodwater. 6 inches of moving water can knock a person down, and 12 inches can carry away most vehicles
Stay off bridges over fast-moving water
Avoid contact with floodwater. It can carry sewage, chemicals, and debris

Phase 3

After a dam failure. The area can stay hazardous for days.

The floodwater from a dam failure can carry contamination and debris well beyond what you can see, and downstream conditions can keep changing after the initial event.

Immediate Safety

Do not return home until local officials say it is safe. The downstream area can remain hazardous for days
Avoid standing water and mud. They can hide debris, chemicals, or damaged infrastructure
Stay away from downed power lines and damaged roads and bridges

Recovery and Documentation

Photograph all damage before moving or cleaning anything for your insurance claim
Contact your insurance company to open a claim promptly
Throw away food and medication that came into contact with floodwater
Check on neighbors, especially anyone who may not have received the warning in time

Gear

Still need to get equipped? Start here.

A few items do most of the work for a household downstream of a dam. These are the ones worth having ready.

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Dam Failure Checklist. Before, during, and after.