BirdAnalyst
Species · South Carolina · BBS 2025 Release · 1966–2024

Snowy Egret Population Trend in South Carolina

All statesWetland birds

Snowy Egret in South Carolina has edged down: down 16% on the route-weighted index since 1968.

-16%Since 1968TrendPercent 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 →
7Routes 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 →
35YearsYears 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 South CarolinaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Snowy Egret in South Carolina. See the full index history below.

Snowy Egret Population Forecast in South Carolina

If the recent trend holds, Snowy Egret in South Carolina is projected to fall about 11% by 2029 — from 0.43 in 2024 to a central estimate of 0.38 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±43.6%, with 80% of held-out values landing inside the 95% band.

-11%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 →
0.38Projected 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 →
0.00–1.295% 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 →
±43.6%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 South Carolina is projected to fall about 11% by 2029 — from 0.43 in 2024 to a central estimate of 0.38 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±43.6%, with 80% of held-out values landing inside the 95% band.19662029
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 →
20250.380.001.2
20260.380.001.2
20270.380.001.2
20280.380.001.2
20290.380.001.2

Snowy Egret Survey Routes in South Carolina

Routes recording Snowy Egret in South Carolina.
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 →
Kiawah Island920241999
Dale919981998
Johns Isle319781966
Adams Run220232007
Hardeeville119761967
Walterboro119711971
Little Mtn119681968

Snowy Egret Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianakansaslouisianamainemarylandmassachusettsmississippimissourinebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaoklahomaoregonrhode-islandsouth-dakotatennesseetexasutahvirginiawisconsinwyoming

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