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Species · Louisiana · BBS 2026 Release · 1966–2025

Snowy Egret Population Trend in Louisiana

All statesWetland birds

Snowy Egret in Louisiana has collapsed: down 90% on the route-weighted index since 1971.

-90%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 →
72Routes 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 →
56YearsYears 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 90% 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 100% by 2030 — from 5.8 in 2025 to a central estimate of 0.00 (95% range 0.00–49). A 5-year backtest shows a typical error of ±109.4%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2030TrendPercent 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 →
0.00Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–4995% 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 →
±109.4%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 100% by 2030 — from 5.8 in 2025 to a central estimate of 0.00 (95% range 0.00–49). A 5-year backtest shows a typical error of ±109.4%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20260.360.0049
20270.050.0049
20280.000.0049
20290.000.0049
20300.000.0049

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
Forked Island14020252008
Woodlawn10220212008
Gran Chenier5619821967
Junior5519911987
Forked Island 25320112010
Creole5219871967
Rayville 24720232009
Richard4520251998
Natchitoches3119911987
Shaw2120241977
Ville Platte2020191990
Gibson1120152000
Esther920251989
Ltl Chenier920251986
Freetown820001978
Morgan City819861973
Fishville820102010
Vinton720082008
Carlisle619881987
Glencoe620181989
Port Allen620242000
River Road520251987
Ramah520251988
Kaplan520231998

Snowy Egret Population Trend in Other States

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

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.