43,633
Between 1989 and 2017, the U.S. federal government bought out 43,633 floodplain properties. A buyout means the government purchases your house, demolishes it, and places the land under a permanent ban on building.
Forty-three thousand sounds like a lot. But those properties are spread across 49 states and 1,148 counties. Per county, the median is eleven. Five hundred sixty counties bought out somewhere between one and ten houses in the space of several decades.
And the median size of a buyout project nationwide is three properties.
One project. Three houses.
This is the largest government-led retreat mechanism the United States has.
One clarification first: those 43,633 are floodplain properties nationwide, not coastal ones. The buyout grew up mainly along inland rivers; the coast is one category within it. How the total splits between coastal and inland, the original study doesn't say — so I won't report a figure.
What managed retreat actually looks like
The term sounds like a column falling back in good order under command.
In practice: three houses on this street come down. The one next door doesn't, because the owner won't sell. The one across the street doesn't either, because it isn't on this round's funding list. What's left is a checkerboard of mown empty lots, and the people still living beside them.
It is slow. From disaster to project closeout takes 5.7 years on average; the longest ran close to seventeen.
And it is fragmenting. From 1989 to 1998, the average project bought out nineteen properties. By 2009–2017, that had fallen to seven.
The scale isn't growing. It's shrinking.
The one time it went furthest
In Terrebonne Parish, Louisiana, there is an island called Isle de Jean Charles. In 2016, the state won a grant through HUD's National Disaster Resilience Competition to move the island's entire population inland — the furthest America has ever pushed the idea of relocating a whole community together.
The new community, The New Isle, was built on roughly 515 acres. Residents began moving in from August 2022. By the fall of 2024 the official count stood at thirty-seven, with nine more units still being delivered. Elapsed time: six to eight years.
Look closely at that number. The official document says "37 residents or families" — whether the unit is people or households, the document itself never specifies. How many moved in total does not appear in the public record.
It did not become a success story
The community on the island is an Indigenous tribe. The trouble began the moment the money arrived: the tribe is not federally recognized, so it could not legally receive the funds directly. The money went to the state, which ran the project.
Then the two sides broke apart. In December 2023 the tribe filed a Title VI complaint. One dispute was over a name — the state had dropped "Isle de Jean Charles" from the name the tribe uses for itself, calling them only the Biloxi-Chitimacha-Choctaw. That, the complaint said, severs the tribe from its homeland in language, and denies its right to name itself.
Another was over a grocery store. The state said it was negotiating with a large chain. The leaders said they wanted the tribe's own community market. The official replied that the chain was what they needed, and that they should be satisfied with it.
Albert Naquin, who pushed for the move for nearly twenty years, never moved into the new community himself: "We were supposed to be a model for other communities. The state took over and messed it all up. Where are the people of Isle de Jean Charles?"
A few households never left at all. The fisherman Edison Dardar put up a hand-painted sign: "We're not moving off this island. Anybody who wants to move can move, but leave us alone."
Scholars note that in the first three years after the state took over, the project's attention went largely to household-by-household outreach, housing options, and site design — not to carrying forward the tribe's existing community institutions.
Money solves the construction. It does not solve "after the move, are we still us?"
The layer that matters more
So far this reads as an expensive, slow relocation that never quite came together. But there is another layer that explains more than all of the above.
Before the project began, most of the island had already gone.
In 2002 there were seventy-eight households on Isle de Jean Charles. By the late 2010s, fewer than twenty-five remained. By household, roughly two thirds had already left over decades of land loss. I won't give a headcount — the public record supports no reliable one.
They weren't moved out. They left on their own. And not all of them left because the sea was coming: some because the road off the island kept flooding and they couldn't reach work; some because shrimping and other fisheries declined in the 1980s.
One point is easy to get wrong, so here it is precisely: some of those thirty-seven had left the island long before the project started. The resettlement plan includes a category for people who moved away before Hurricane Isaac in 2012, letting them take a free lot and build. It came with conditions — proof you could finance construction, and residence in one of several designated parishes as of August 2012. So "those who left first" and "those who were resettled" are not two separate groups. You cannot subtract one number from the other.
What is certain: the dozens of households who left first did so with no project and no funding. They appear on no public list I could find.
Two retreats
The official one has a legal basis, federal funding, a project number, a closeout report. It enters the statistics, gets analyzed and reported. Three houses per project, 5.7 years, and at its most complete, thirty-seven.
The market one is people listing their houses, selling, and going. No project, no name, and no place in any retreat statistic I could find.
A study by Rice University's Kinder Institute and its center for coastal futures used address-level data from more than five hundred buyout counties between 2007 and 2017, tracking over seventy thousand movers. James Elliott and Deborah Banerjee concluded that nationally, the vast majority of movers — roughly fourteen out of every fifteen — were not federal buyout participants at all, but neighbors who moved through ordinary real estate transactions.
Fourteen out of fifteen. On the very blocks where the government was buying houses, the official program accounts for about one-fifteenth of the people who actually left.
The retreat has been happening all along. It just isn't happening through the program named "retreat."
What the sieve is
If most people leave by selling, then what decides who goes first isn't policy. It's who can sell. The evidence here is not clean:
- Between counties: counties that completed buyouts have more people, higher incomes, more education. But the researchers read income and population as proxies for local administrative capacity — not as proof that wealth causes buyouts.
- Within counties: buyout sites fall on average in lower-income, less-educated neighborhoods.
- On race: the findings conflict. A ZIP-code-scale national study found buyouts concentrated in a county's more disadvantaged neighborhoods. A census-tract study controlling for flood losses and income found that in urban core counties, whiter neighborhoods were more likely to get the program.
The two point in opposite directions. So this piece will not tell you America buys out poor neighborhoods on purpose, and it will not tell you anyone is screening by race. The available evidence supports neither claim.
Outcomes diverge too. Nationally, about 70% of buyout sellers moved to lower flood risk. But in the same data, the lower the income and the more Black and Hispanic the neighborhood, the farther and more scattered owners moved. The Staten Island sample moved almost entirely into higher-poverty census tracts, about a fifth of them into higher flood risk.
All that can be said is this: retreat is never a whole city stepping back at once. It passes through application forms, appraisals, and property titles first — and then it sorts people.
The people who don't even get to sell
Federal law treats the homeowner as a willing seller: you decide whether to sell, and you can negotiate the price. Tenants forced out because their building was acquired are classified as involuntarily displaced — in theory entitled to moving costs, rent differential payments, and relocation counseling.
So tenants are not uncompensated. Nor do they have the owner's choice. An owner can at least negotiate a price; a tenant usually waits for the landlord's decision. And in the data afterward, I found no public tracking of where those tenants went.
In one retreat, the people were counted. In the other, all that remains is a property transaction record. And outside both, there are people to whom even that record doesn't belong.
Where the risk goes
After an official buyout, the land is permanently deed-restricted. The house comes down, the lot stays empty, and the risk exposure at that spot is eliminated.
Market retreat eliminates nothing. You sell, and the risk transfers to the next buyer or the next tenant. The house is still there, someone still lives in it, and the next time the water comes it floods the same house.
One retreat reduces risk. The other only moves it. The larger one is the second.
About "underwater by 2100"
The widely circulated claim about New Orleans runs like this: at a certain sea level the city becomes an island in the Gulf; higher still, no coastal defense works. The claim has a source, but four things need stating precisely.
One: it comes from a Perspective article, published in 2026 in Nature Sustainability. A Perspective offers an assessment, not new observational data. The accurate phrasing is "an assessment paper proposes" — not "a study measured" or "the data show."
Two: the two heights are the ends of one range. The paper gives three to seven meters. At three, New Orleans would be at best a highly exposed island in the Gulf; at seven, no coastal defense system can be expected to work.
Three: that three-to-seven meters is relative sea level. It already includes Louisiana's own land subsidence. It is a local figure, not global mean sea level, and the two cannot be compared directly.
Four: on timing. The three-to-seven-meter figure carries no timetable, and the paper says outright it can't give one. It does make one statement with a year attached: projecting from a 75% wetland loss around 2070, the defended New Orleans area is likely to be surrounded by the Gulf before the end of this century.
Keep these apart: one is a long-term height with no timetable, the other a landscape judgment with a year. Stitch them together and you get "three meters of sea level rise by 2100" — which the paper never said.
For comparison, the IPCC's Sixth Assessment gives global mean sea level rise by 2100, against a 1995–2014 baseline, of 0.38 m under low emissions and 0.77 m under high. That is not the same quantity as three to seven meters, so I won't say the paper's range far exceeds the IPCC projection. Those are two different rulers.
What can be said with a year attached is the wetland line. A 2024 study in Nature Communications, based on thirteen years of observations from 253 monitoring stations along the Louisiana coast, states in its abstract that under the intermediate SSP2-4.5 scenario, submergence of about 75% of Louisiana's coastal wetlands by 2070 is "a plausible outcome." The authors added their own caveat: they were unwilling to convert that into a precise rate of wetland loss.
I go through this in such detail not to look rigorous, but because once these numbers are stitched together they form a causal chain that looks powerful and does not exist in the original research.
Closing
The more distant the number, the easier it is to stitch. The retreat happening now has no number at all.
It isn't that America has no mechanisms. There are federal mitigation grants, community development block grants, a voluntary community relocation program at Interior. There was also a community resilience program, terminated by FEMA in April 2025; late that year a court ruled the termination unlawful and issued a permanent injunction, and it still hasn't actually been restored. Nor is there no precedent: Newtok and Shishmaref in Alaska are underway, and Fiji completed a whole-village move inland back in 2014.
The accurate statement is this: there is no unified, advance, city-scale retreat plan. There are only projects launched after each disaster, counted one house at a time. Added up: decades, and more than 43,000 properties.
And alongside those projects, people are already leaving. They sell their houses and move tens of miles away, or to another state. This has no name. I found no one counting it.
An island lost two thirds of its households before its own relocation project even began.
The retreat we can see is so small it looks like an experiment. The one actually underway, we know only that they sold their houses.
We don't know where they went.
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