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Species · Oregon · BBS 2026 Release · 1966–2025

Bullock's Oriole Population Trend in Oregon

All statesForest birds

Bullock's Oriole in Oregon has edged up: up 12% on the route-weighted index since 1970.

+12%Since 1970TrendPercent 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 →
90Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bullock's Oriole 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 →

No notable trend signals for Bullock's Oriole in Oregon. See the full index history below.

Bullock's Oriole Population Forecast in Oregon

If the recent trend holds, Bullock's Oriole in Oregon is projected to fall about 65% by 2030 — from 2.5 in 2025 to a central estimate of 0.88 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±45.9%, with 80% of held-out values landing inside the 95% band.

-65%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 →
0.88Projected 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 →
0.00–2.595% 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 →
±45.9%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, Bullock's Oriole in Oregon is projected to fall about 65% by 2030 — from 2.5 in 2025 to a central estimate of 0.88 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±45.9%, with 80% of held-out values landing inside the 95% band.19682030
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 →
20261.00.002.7
20271.00.002.6
20280.960.002.6
20290.920.002.6
20300.880.002.5

Bullock's Oriole Survey Routes in Oregon

Routes recording Bullock's Oriole 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 →
Sparta3820251971
Bridgeport2220251986
Twickenham2220252010
Modoc Point 22120252024
Sams Valley1520251993
Warner Vally1320241993
Emigrant Lk1120011972
Pendleton920251972
Umatilla920252021
Donnybrook919971997
Umpqua820251970
Alvord Lake820251970
Fish Lake820251977
Mikkalo820251996
Derby719931968
Dayton720151988
Selma720251993
Newbridge620251992
Green620251994
Salem620251993
Trout Creek620251996
Modoc Point520181969
Emigrant Lake 2520252002
Madras520251997
Crane520241993

Bullock's Oriole Population Trend in Other States

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