Dam Failure and Flash Flood Evacuation With Pets

If a Flash Flood Warning is active for you right now, stop reading and move. Get every dog leashed and every cat in a carrier, take whatever bag is already by the door, and get to higher ground. The National Weather Service’s instruction for a Flash Flood Warning is to move immediately to high ground if you are in a flood-prone area, and it says outright that “you may only have seconds to move to higher ground.” Move up and out of the low ground, not along it. NWS Pittsburgh’s flash flood instructions say to climb to safety on higher ground and: “Get out of areas subject to flooding. This includes dips, low spots, canyons, washes, etc.” Do not go back for anything. Do not drive or walk through moving water to reach an animal. If an animal cannot be found in the seconds you have, go without it rather than delaying your own exit. Come back to the rest of this page once you are above the water.

Everything below is for the other days, when nothing is happening and you can still find out, in advance and by name, whether a specific dam upstream would put water in your living room, and how long you would have to get animals into a car if it did.

The short version:

1. Search the National Inventory of Dams for dams upstream of your address, and note each one’s name, NID ID, hazard class and Condition Assessment.
2. Call your state dam safety official and ask whether your address falls inside the mapped inundation area for that dam.
3. Get the flood wave travel time to your address, then time your own pet loading with a stopwatch and compare the two.

Why this is not just flooding

Our flood and flash flood pet preparedness playbook applies here too. This page exists because dam failure breaks two assumptions that other flood guides rely on.

The first assumption is that weather warns you. A hurricane announces itself for days. Even a burn scar debris flow, covered in our landslide and mudslide evacuation guide, correlates with a rain forecast you can watch. Dam failure does not reliably do either. The Association of State Dam Safety Officials (ASDSO) attributes roughly 34 percent of U.S. dam failures to overtopping, which it ties to inadequate spillway design, debris blockage of spillways or settlement of the dam crest. It attributes about 30 percent to foundation defects and about 20 percent to piping, which is internal erosion from seepage. Overtopping is water spilling over the dam, so it goes with high water, which a forecast can sometimes show. ASDSO’s descriptions of foundation defects and piping do not name a storm as the trigger, so a forecast may show nothing before they fail.

FEMA’s emergency action planning guidance for dam owners treats the two cases separately. It says many local emergency management organizations request maps for both a “sunny day” failure and a flood failure. It is direct about which is worse for people downstream: a fair weather failure “is generally considered to have the most potential for loss of human life, primarily due to the element of surprise.” FEMA’s flood insurance program puts the underlying point in five words: “No dam is flood proof.”

For a pet owner that changes the whole plan. If the hazard has no season or forecast, a carrier that lives in the garage between hurricane seasons is not staged. It is stored.

The second assumption is that the flood behaves like a flood. ASDSO compares ordinary floodplain maps with dam failure inundation maps: “Dam failure flood inundation areas can be much larger than the 1-percent-annual-chance floodplain.” The flood is more like a wave than a steady current, with great power and force. A house outside the mapped 100-year floodplain, with no flood insurance requirement, can still sit inside a dam’s inundation area. The two maps answer different questions, and only one was drawn with a breach in mind.

The National Weather Service classifies the event as a flash flood, and its definition names dam or levee failure as a cause alongside excessive rainfall and ice jam releases. The warning language is the same as for rain-driven flash floods, so nothing in the alert tells you the cause. NWS says a Flash Flood Warning “can be issued due to excessive heavy rain or a dam/levee failure.”

What alert you will actually receive

The NWS has no separate dam failure warning. You get a Flash Flood Warning, and NWS defines the tiers this way:

Alert	What NWS says it means	What you do with pets
Flood Watch	Conditions are favorable for flooding; flooding is possible but not certain	Bring animals indoors and account for all of them. Confirm the carrier and leash are at the exit door.
Flood Advisory	Flooding “not expected to be bad enough to issue a warning” but may cause significant inconvenience	Stay aware. Do not walk dogs near swollen creeks or drainage channels.
Flash Flood Warning	“A flash flood is imminent or occurring.” Can be issued for heavy rain or a dam/levee failure. You may have only seconds to move.	Leash and crate now, grab the staged bag, move to high ground. No assessment step.
Flash Flood Emergency	Reserved for “EXCEEDINGLY RARE situations” with a severe threat to human life and catastrophic damage	Same actions, no delay. If you are still deciding, you are already late.

Two notes for animal owners.

First, the warning may not reach your phone in time, or at all. NWS says “you will not always have a warning that these deadly, sudden floods are coming.” Federal emergency action planning guidance anticipates cases where campgrounds, recreational facilities or residences sit below a dam where local authorities could not issue a timely warning. If you live, camp or board animals directly below a dam, you may be in that category, and the alert system may not be what saves you.

Second, the alert channel matters more here than for slow hazards. Ready.gov’s flood guidance says to sign up for your community’s warning system and names the Emergency Alert System and NOAA Weather Radio as additional paths. A NOAA weather radio with S.A.M.E. (Specific Area Message Encoding) can be programmed to your county and sounds an alarm for warnings coded to it. Midland says its WR120B stays powered during outages on three AA batteries.

A radio is a receiver, not a time machine. It improves the odds that you hear a warning that was issued. It does nothing when no warning was issued, which is why the rest of this page is about work you do before anything happens.

Find out whether you are downstream

The first two steps are a single sitting at a computer. The third is a phone call to a state regulator that may take days to come back, so start it long before you need the answer.

Step one: search the National Inventory of Dams. The NID is the public database of dams in the United States and its territories, maintained by the U.S. Army Corps of Engineers. After several dam failures in the early 1970s, Congress authorized USACE to inventory the nation’s dams under P.L. 92-367, and USACE published the first version in 1975. FEMA’s flood insurance program lists it first among its five steps for dam flood risk: find out where dams are located in your vicinity by searching the NID.

The NID does not include every impoundment. ASDSO says a dam qualifies if it is classified high or significant hazard, or if it is at least 25 feet high with storage over 15 acre-feet, or has at least 50 acre-feet of storage and a height over 6 feet. The Congressional Research Service adds that thousands of dams do not meet these criteria and are therefore not in the NID. Small ponds and private impoundments can be absent entirely, and FEMA’s classification guideline warns that the failure of any dam or water-retaining structure, no matter how small, could endanger downstream life and property. A clean NID search is not proof that nothing is impounded upstream of you.

Step two: read the hazard classification correctly. The field’s name suggests danger, but it does not measure danger. FEMA’s federal guideline defines three classes by consequence:

• Low hazard potential. Failure or mis-operation results in no probable loss of human life and low economic and environmental losses, principally limited to the owner’s property.
• Significant hazard potential. Failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage or disruption of lifeline facilities.
• High hazard potential. Failure or mis-operation “will probably cause loss of human life.”

Then the sentence that reframes the exercise: hazard potential classification “does not reflect in any way on the current condition of the dam (e.g., safety, structural integrity, flood routing capacity).” A high hazard dam is a dam with people below it, not a dangerous dam. A well maintained structure gets classified high hazard once houses are built downstream, and a crumbling one in an empty valley stays low hazard. ASDSO makes the same point about the maps: they “do not reflect the safety or integrity of a dam.” What the class does tell a pet owner is that a regulator has already concluded people, and therefore animals, would be in the water’s path.

Step three: call your state dam safety official. FEMA’s flood insurance guidance makes this its second step: contact your State Dam Safety Official to learn whether an Emergency Action Plan (EAP) is in place for the dam near you. ASDSO keeps a directory of state dam safety programs and contacts.

How you ask matters. Asking whether there is an inundation map is a records request, and records requests get refused. Ask whether you are inside the line, which is a public safety question a dam safety office is set up to answer. For example:

I’m a resident at [your address]. Does my address fall inside the mapped dam failure inundation area for [dam name, NID ID]? I’m not asking for a copy of the map, just whether I’m inside it, and if I am, roughly what the flood wave travel time to my location is.

Then ask two follow-ups: does this dam have a current Emergency Action Plan, and who issues the evacuation notice for my neighborhood, and how would I receive it? The second matters because FEMA’s guidance puts evacuation planning and implementation with state and local officials, not the dam owner. The owner warns the authorities and the authorities warn you, so knowing which agency sits in that second link tells you whose alert system to sign up for.

If the state office is not the right door, there are two more. ASDSO’s figures are that states regulate about 70 percent of U.S. dams and federal agencies about 14 percent, and that “the remaining percentage is unregulated due to state or federal exemptions.” A state office may correctly tell you the dam is not theirs. Then go to your county or city emergency management office, since FEMA’s dam owner guidance puts evacuation planning with state and local officials, and ask the same address question. If the dam is federally owned or regulated, the owning agency listed on its NID record is the third door. If all three come back with nothing usable, that is itself an answer: your plan has to work without a travel time. Skip to the loading section and build for the shortest window you can imagine.

The national map probably will not answer it

In the USACE National Inventory of Dams public data file (file updated September 23, 2026), the counts for 92,766 dam records were:

NID field	Count	Share of all records
Total dam records	92,766	100%
High hazard potential	17,050	18.4%
Significant hazard potential	11,353	12.2%
Low hazard potential	60,298	65.0%
Hazard potential undetermined	4,065	4.4%
Inundation maps added to the NID	1,533	1.7%

Among the 17,050 high hazard dams, inundation maps had been added to the NID for 1,363, about 8.0 percent. Emergency Action Plans fared much better: 13,201 of those dams (77.4 percent) were marked as having an EAP prepared, 2,476 were marked no, 1,361 were marked not required, and 12 records were blank.

Do not over-conclude from this. The field is “Inundation Maps Added to NID,” which records whether a map has been contributed to the national database, not whether one exists. Federal guidance lists inundation maps as one of six basic elements of an EAP and says “All of the elements should be included in a complete EAP,” so a dam with an EAP very likely has a map somewhere. That is a should in a guideline, not a legal requirement, and the map may be held by the state regulator, the dam owner or a local emergency management office.

The practical conclusion is not that no maps exist. For most dams, the national database will tell you the dam is there and how it is classified, and will not show the flooded area. For the question of whether your address is inside the line, the call to your state dam safety office is usually the only step that produces an answer.

What else to read on your dam’s NID record

Hazard class is not the only useful column. These are the field names as they appear in the NID data:

NID field	What it tells you	Why it matters for a pet plan
Condition Assessment	A rating of the structure itself, separate from hazard class	This is the condition field. A Poor or Unsatisfactory rating is a reason to push harder on the phone call, not to panic
Condition Assessment Date, Last Inspection Date, Inspection Frequency	How current that rating is	A Satisfactory rating from long ago is a weaker statement than a recent one
NID Height (Ft), Max Storage (Acre-Ft)	How much water is held back	Rough sense of scale, and context when you ask about travel time
River or Stream Name	The watercourse a release would follow	Shows which way the water goes, the difference between an evacuation route and a flood path
Distance to Nearest City (Miles), Latitude, Longitude	Where the dam sits relative to you	Lets you judge whether you are plausibly downstream before you call
EAP Prepared, EAP Last Revision Date	Whether a plan exists and how stale it is	An EAP on file means a map probably exists, so your call has something specific to ask for

In the same file, across the 17,050 high hazard dams, Condition Assessment was Satisfactory for 5,304, Fair for 5,169, Poor for 2,289 and Unsatisfactory for 504. Another 3,784 carried no usable rating: 2,154 Not Rated, 1,398 Not Available and 232 blank. So a little over 16 percent of these dams carried a Poor or Unsatisfactory rating, and a little over 22 percent carried no rating you can read. Neither number predicts anything about a particular dam, and none of it substitutes for the state office. It lets you call with a specific question.

Turn the map into a pet loading budget

FEMA’s federal guidance says an inundation map should show, at minimum, the peak discharge, the maximum inundation elevation, and “the travel time (in hours and minutes) of the leading edge and peak of the dam break flood wave to critical locations.” That travel time is the most useful number a pet owner can get from any dam document: your number, for your address, from your dam. It might be tens of minutes or hours depending on distance downstream and terrain.

Federal guidance attaches a caution: the limits of flooding and travel times “are approximate and should be used only as a guideline for establishing evacuation zones.” The number is a planning input, not a countdown you can spend to the last minute. Build your plan to finish comfortably inside it.

Then the work is arithmetic:

• Time your actual loading, once, with a stopwatch. Ready.gov’s pet guidance says to note where your pets hide so you can find them quickly, and AVMA recommends you “practice evacuating with all pets and their supplies.” Do it as a drill on an ordinary evening: from where you normally sit, to every animal secured, to bag in hand, to the car doors closed.
• Compare that to the travel time, then subtract your drive. Getting animals into the car is not the finish line; getting out of the mapped area is. Federal guidance notes that emergency management agencies may ask for evacuation routes and shelters to be marked on inundation maps, so ask whether yours shows them.

Flood wave travel time to your address, minus the time to drive clear of the mapped area, minus a margin, equals the loading budget you actually have.

An illustration of the method, not data about anyone’s dam: suppose the state office says the leading edge reaches your address in about 45 minutes, and you have timed the drive out of the mapped area at 12 minutes. Take a quarter of the travel time off the top as margin, which leaves about 34 minutes. Subtract the 12-minute drive and the loading budget is roughly 22 minutes. If your stopwatched two-cat drill came in at 9 minutes, you have room. If it came in at 24, you do not. Every number in that paragraph is invented to show the shape of the calculation. Yours must come from your own map and stopwatch.

Then you land in one of three places:

• Loading fits comfortably inside the budget. Stop optimizing. Re-run the drill once a year, and whenever you add an animal.
• The two numbers are close. The fix is staging, not speed. You will not reliably get faster at catching a cat under a bed; you will get faster by removing steps: a carrier already assembled by the exit door, a leash on a hook, a bag already packed.
• Loading exceeds the budget. Staging will not save it, and this is the case guides skip. Directly below a dam, with several animals, it is a normal result. The honest options are structural: keep cats in one closable room at night instead of loose in the house; move the animals themselves by boarding or relocating during any period a dam is under active concern; commit a second adult in advance so loading runs in parallel; or accept, in writing and ahead of time, that a warning-triggered evacuation with every animal is not achievable at your address, and plan to leave earlier on any signal at all. That last one is a real plan. Discovering it during a warning is not.

The ASPCA names the same fix from the pet side: store the emergency kit and leashes as close to an exit as possible, and make sure everyone in the family knows where it is. AVMA says to keep the kit “in an easy-to-carry, waterproof container close to an exit” and animal equipment “where rescue personnel, neighbors, and friends can easily find it.”

If you have more animals than hands, decide the sequence now. Our guide to deciding which pet to evacuate first works through it, and multi-pet go-bag math covers weight and volume.

What goes in a dam zone go bag

The contents barely differ from any pet evacuation kit; start from our DIY pet go-bag checklist. Ready.gov recommends two kits: a larger one for sheltering in place and a lightweight one for evacuating. For a dam zone the lightweight one matters, because sheltering in place is not a strategy when the water arrives as a wave.

Three adjustments for this hazard:

• Waterproof the container and the paperwork. Our waterproof pet document kits guide covers sealing vaccination records, microchip registration and proof of ownership, which is what reunites you with an animal that ends up at a shelter three counties away.
• Keep the bag at the door you would leave through, not the one you use least. It removes a leg of movement from the drill you just timed.
• If a boat or water crossing is even conceivable, fit a life jacket in advance. Our dog flood life jackets guide covers fit. A life jacket is insurance for a controlled water evacuation carried out by responders, never permission to enter moving water yourself.

Want the full go-bag list on paper? Get the free printable go-bag checklist.

Everything else on the standard list still applies: several days of food and water per animal, medication, a collar with current ID, a spare leash and harness, and a carrier per animal. Microchip registration with a working phone number is the piece people most often let lapse, and it does the most work afterward.

Never enter the water, and never send a pet into it

The rule is absolute. Ready.gov states that six inches of moving water can knock you down and one foot can sweep your vehicle away, and tells you not to walk, swim or drive through flood waters (Turn Around, Don’t Drown). NWS’s during-a-flood guidance is more precise about vehicles: “12 inches of water can float a car or small SUV, 18 inches of water can carry away large vehicles.” ASDSO describes a dam break flood as “more like a wave than a steady current.” In practice:

• Do not drive through water to reach an animal at home. A vehicle that floats with a pet inside makes things worse.
• Do not let a leashed dog into moving water, and do not send a pet across a flooded gap on the theory that it can swim. Current that moves a vehicle moves a large dog instantly.
• If a pet is stranded across water, note the exact location and give it to responders. Entering the water turns one problem into two. This is the rule our floodwater car escape guide applies to a vehicle.
• If you are driving out and the vehicle stalls in water, leave it. NWS Pittsburgh says to leave a stalled vehicle immediately and seek higher ground, because rapidly rising water may engulf the vehicle and its occupants and sweep them away. A carrier comes with you if you can lift it in one motion, not at the cost of standing in rising water arranging things.

If you get cut off before you can leave

This is a last resort, not a plan you choose instead of leaving. Three sources each supply part of it.

The ASPCA’s flood instruction is to go to the highest location in your home, or a room with access to counters or high shelves where your animals can take shelter. NWS adds the call: “If you are trapped by moving water, move to the highest possible point and call 911 if possible.” Ready.gov supplies the limit on “highest”: get to the highest level if trapped in a building, get on the roof only if necessary and signal for help once there, and “Do not climb into a closed attic to avoid getting trapped by rising floodwater.” A closed attic is the one high place in a house with no exit above it. Do not take animals or yourself into one.

Two points about carriers are our reasoning, not any agency’s instruction. First, take the carriers and go bag up with you if you can carry them, because a carrier left at ground level is gone. Second, a closed carrier is a way to move an animal, not a way to hold one in a building that is filling with water. An animal sealed in a hard carrier cannot climb, cannot swim and cannot be seen by a rescuer. If you are sheltering high and waiting, the animal belongs on the counter or shelf with you, secured by a leash or harness or held, with the carrier open beside you, ready to close when you are moving again. Do not leave a sealed carrier at a level the water can reach.

After the water goes down

Treat the aftermath like any flood. Ready.gov says floodwater can be contaminated and contain dangerous debris, and that holds whatever released it. A receding waterline can also leave unstable ground, hidden glass and metal, and fences that no longer hold.

• Keep dogs leashed and cats carried on every trip outside until you have walked the ground yourself. A pet that has never left the yard can walk through a gap where a fence used to be.
• Do not let animals drink standing water or puddles. Offer only your clean supply until the water system is confirmed safe. AVMA lists “exposure to or drinking from slow-moving or stagnant water sources” as a leptospirosis risk factor for dogs.
• Call your veterinarian about cleaning an animal that has been in floodwater, especially one with any wound. Ready.gov says floodwater can be contaminated, and AVMA describes dogs becoming infected with leptospirosis when mucous membranes or skin wounds are exposed to urine or urine-contaminated water or soil. Neither source gives cleaning instructions, so ask the vet what to do.
• Watch for downed lines in and near standing water and keep animals clear of any area utilities have not cleared.

On the vet call, be specific about the exposure. If an animal drank, swam in or was submerged in floodwater, say so when you call, even if it seems fine and even if the flooding was days ago. AVMA describes leptospirosis as a bacterial disease that can occur anywhere, especially “after heavy rainfall and flooding.” Its most common signs in dogs are loss of appetite, vomiting, lethargy, abdominal pain, diarrhea, jaundice, dehydration, drinking or urinating more than usual, weight loss, and stiffness or muscle pain. The signs “tend to be non-specific” and overlap with other diseases, and AVMA says leptospirosis “may be suspected based on the exposure history and signs shown by the dog.” Your vet cannot use an exposure history you do not give. It can progress to kidney or liver failure, so make this a same-day call. AVMA notes that many mammals are susceptible, including people, so wear gloves when cleaning up urine from a sick animal and wash your hands afterward. Cats can be affected, but AVMA says this happens only rarely.

We are not veterinarians, and nothing here is a diagnosis or treatment plan. It is a list of what to mention so the person who is a veterinarian can do their job. For a suspected poisoning, the ASPCA Animal Poison Control Center is reachable 24 hours a day at (888) 426-4435; a consultation fee may apply.

Our flood pet preparedness playbook covers the contamination, mold and displaced wildlife hazards of the recovery window in more detail.

The dam zone checklist

• Search the National Inventory of Dams for dams near your address and note each one’s name, NID ID, hazard class, Condition Assessment and River or Stream Name. Remember that hazard class describes consequences, not condition.
• Call your state dam safety official and ask whether your address falls inside the mapped inundation area, rather than asking for the map itself.
• If the state says the dam is not theirs, ask your county or city emergency management office the same address question.
• Ask which agency issues the evacuation notice for your neighborhood, then sign up for that agency’s alert system.
• Get the flood wave travel time to your location from the inundation map, and treat it as approximate.
• Time your own pet loading with a stopwatch, then compare it honestly against that travel time minus your drive out and a margin.
• If loading fits, maintain it. If it is close, close the gap by staging. If it does not fit, decide now which structural change you are making.
• Agree the direction rule out loud: higher ground means up and out of the low ground, not along the road that follows it.
• Agree the stop rule out loud: if an animal cannot be found in the seconds a warning gives you, everyone leaves anyway. A Flash Flood Warning means move, not assess.
• Keep a S.A.M.E. capable NOAA weather radio on fresh batteries where you will hear it at night, and confirm your microchip registration has a phone number that still works.
• Decide your multi-pet sequencing now, in writing, so nobody decides it during a warning.

Related reading

For the broader hazard, start with flood and flash flood pet preparedness. If your risk is moving ground rather than released water, evacuating pets during a landslide or mudslide covers the other minutes-not-hours hazard. For water reaching a vehicle, see floodwater car escape with a dog. Build the bag from the DIY pet go-bag checklist, and work through your household plan with the pet emergency plan tool. Every other hazard has an entry at the pet emergency playbooks hub.

The one thing to do today: open the National Inventory of Dams, type in your address, and find out whether the question applies to you. Everything else here waits on that one search.