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Species · Louisiana · BBS 2025 Release · 1966–2024

Snowy Egret Population Trend in Louisiana

All statesWetland birds

Snowy Egret in Louisiana has collapsed: down 82% on the route-weighted index since 1971.

-82%Since 1971TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
71Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
55YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Snowy Egret Trends in LouisianaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Snowy Egret has collapsed in Louisiana: down 82% on the route-weighted index since 1971.

Snowy Egret Population Forecast in Louisiana

If the recent trend holds, Snowy Egret in Louisiana is projected to fall about 54% by 2029 — from 7.7 in 2024 to a central estimate of 3.5 (95% range 0.00–26). A 5-year backtest shows a typical error of ±57%, with 100% of held-out values landing inside the 95% band.

-54%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
3.5Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–2695% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±57%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Snowy Egret in Louisiana is projected to fall about 54% by 2029 — from 7.7 in 2024 to a central estimate of 3.5 (95% range 0.00–26). A 5-year backtest shows a typical error of ±57%, with 100% of held-out values landing inside the 95% band.19672029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20254.00.0026
20263.90.0026
20273.70.0026
20283.60.0026
20293.50.0026

Snowy Egret Survey Routes in Louisiana

Routes recording Snowy Egret in Louisiana.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Maurice18020241989
Woodlawn10220212008
Gran Chenier5619821967
Junior5519911987
Forked Island 25320112010
Creole5219871967
Rayville 24720232009
Natchitoches3119911987
Richard2920241998
Forked Island2320242008
Shaw2120241977
Ville Platte2020191990
Ramah1920241988
Gibson1120152000
Freetown820001978
Morgan City819861973
Fishville820102010
Vinton720082008
Carlisle619881987
Glencoe620181989
Frogmore620241998
Port Allen620242000
River Road520241987
Mayflower520241995
Esther520241989

Snowy Egret Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianakansasmainemarylandmassachusettsmississippimissourinebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaoklahomaoregonrhode-islandsouth-carolinasouth-dakotatennesseetexasutahvirginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.