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Species · Oregon · BBS 2025 Release · 1966–2024

Trumpeter Swan Population Trend in Oregon

All statesWaterfowl

Trumpeter Swan in Oregon has collapsed: down 84% on the route-weighted index since 1974.

-84%Since 1974TrendPercent 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 →
24YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Trumpeter Swan 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 →

Trumpeter Swan has collapsed in Oregon: down 84% on the route-weighted index since 1974.

Trumpeter Swan Population Forecast in Oregon

If the recent trend holds, Trumpeter Swan in Oregon is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±52.5%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.01Projected 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 →
0.00–0.0995% 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 →
±52.5%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, Trumpeter Swan in Oregon is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±52.5%, with 100% of held-out values landing inside the 95% band.19722029
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 →
20250.010.000.09
20260.010.000.09
20270.010.000.09
20280.010.000.09
20290.010.000.09

Trumpeter Swan Survey Routes in Oregon

Routes recording Trumpeter Swan 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 →
Harney Lake319931993
Fish Lake220241972
Warner Vally119951995
Clover Creek119961996
Princeton119731973
Malheur Nwr119921992

Trumpeter Swan Population Trend in Other States

alaskaarkansasidahoiowamichiganminnesotamontananebraskanevadanorth-dakotaohiosouth-dakotautahwashingtonwisconsinwyoming

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