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Louisiana: Risks & Trends

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Same standard as every other page on this site: every figure below is independently sourced, and figures that vary across sources, or measure genuinely different things, are flagged as such rather than collapsed into one number that looks more precise than the underlying data actually supports.

Hurricane Katrina (2005)

MetricFigure
Total deaths (most sources) 1,390+
Total deaths (some Louisiana-specific counts) 1,500+
Total damage ~$125 billion
Levee/floodwall failure locations 50+
Share of New Orleans flooded 80%
Share of St. Bernard Parish flooded 95%
Residents who never returned permanently ~400,000
Leading causes of death Drowning (~40%), injury/trauma (~25%), heart conditions (~11%)

Why the death toll figure varies

Different sources count deaths across different geographic scopes and time windows, some limited to direct storm/flood deaths in the immediate aftermath, others including a broader count of Louisiana residents whose deaths were ultimately attributed to the disaster over a longer period. Both figures are credible; they answer slightly different questions about scope and timeframe, not a factual dispute.

Coastal land loss: an ongoing, standing crisis

MetricFigure
Share of lower-48 intertidal wetlands in Louisiana >45%
Share of the nation's total coastal wetland loss occurring in Louisiana >90%
Acres lost, 1932-2000 ~1.2 million
Additional acres projected lost by 2050 ~448,000
Historical average loss rate, 1985-2010 16.6 sq mi/year
Current average loss rate 10.9 sq mi/year (6,944 acres/year)

The 'football field an hour' statistic, precisely

The widely repeated claim that Louisiana loses “a football field of land every hour” is accurate as a 25-year average specifically for 1985-2010, not as a description of a constant, ongoing rate happening in real time today. Louisiana has never lost land at a literal steady hourly clip; the rate varies significantly year to year depending on storms and other factors, and the current average (10.9 sq mi/year) is meaningfully lower than the 1985-2010 average (16.6 sq mi/year). The land loss is real and severe either way, but the specific “every hour” framing describes a historical average, not a live rate.

What these two have in common

Hurricane Katrina and Louisiana’s coastal land loss are connected in a direct, physical way: the coastal wetlands that have been disappearing for decades once provided a natural buffer against storm surge, meaning the same category of storm pushes further inland and does more damage today than it would have when more of that buffer still existed.

Sources