BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Bullock's Oriole In Great Basin

All regionsGreat BasinForest birds

Bullock's Oriole in Great Basin has increased: up 31% on the route-weighted index since 1970.

+31%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 →
212Routes In RegionSurvey 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 SignalsNotable 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 Great Basin. See the full index history below.

Bullock's Oriole In Great Basin Population Forecast

If the recent trend holds, Bullock's Oriole in Great Basin is projected to stay roughly flat through 2030, near 3.1 (95% range 2.2–4.1). A 5-year backtest shows a typical error of ±39.1%, with 40% of held-out values landing inside the 95% band.

+6%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 →
3.1Projected 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 →
2.2–4.195% 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 →
±39.1%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 Great Basin is projected to stay roughly flat through 2030, near 3.1 (95% range 2.2–4.1). A 5-year backtest shows a typical error of ±39.1%, with 40% 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 →
20263.12.14.0
20273.12.14.0
20283.12.24.1
20293.12.24.1
20303.12.24.1

Routes In Great Basin

Routes recording Bullock's Oriole in Great Basin.
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 →
Iron GateCALIFORNIA422019
NighthawkWASHINGTON352025
DorrisCALIFORNIA262019
EllensburgWASHINGTON262025
YakimaWASHINGTON222025
Modoc Point 2OREGON212025
CedarvilleCALIFORNIA202025
NubieberCALIFORNIA162018
Pasadena ValIDAHO152016
PrestonIDAHO152023
PocatelloIDAHO132019
Warner VallyOREGON132024
Magic MtnIDAHO122025
TwispWASHINGTON122024
Scootney ReservoirWASHINGTON122025
Glenns FerryIDAHO111986
Ruby ValleyNEVADA112001
PromontoryUTAH112025
Davis CreekCALIFORNIA102025
PicaboIDAHO102025
Lake ChelanWASHINGTON102025
Honey LakeCALIFORNIA92025
PendletonOREGON92025
UmatillaOREGON92025
TonasketWASHINGTON92018

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