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Species · Oregon · BBS 2025 Release · 1966–2024

Snowy Egret Population Trend in Oregon

All statesWetland birds

Snowy Egret in Oregon has fallen sharply: down 67% on the route-weighted index since 1977.

-67%Since 1977TrendPercent 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 →
6Routes 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 →
18YearsYears 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 OregonNotable 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 fallen sharply in Oregon: down 67% on the route-weighted index since 1977.

Snowy Egret Population Forecast in Oregon

If the recent trend holds, Snowy Egret in Oregon is projected to stay roughly flat through 2016, near 0.00 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±237.7%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2016TrendPercent 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 2016 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1495% 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 →
±237.7%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 Oregon is projected to stay roughly flat through 2016, near 0.00 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±237.7%, with 100% of held-out values landing inside the 95% band.19722016
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 →
20120.000.000.14
20130.000.000.14
20140.000.000.14
20150.000.000.14
20160.000.000.14

Snowy Egret Survey Routes in Oregon

Routes recording Snowy Egret in Oregon.
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 →
Princeton519791972
Malheur Nwr319891989
Fish Lake319941986
Hazel Camp220061997
Warner Vally120112002
Blizzard Gap120021987

Snowy Egret Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianakansaslouisianamainemarylandmassachusettsmississippimissourinebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaoklahomarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvirginiawisconsinwyoming

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