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

Black-throated Gray Warbler In Great Basin

All regionsGreat BasinForest birds

Black-throated Gray Warbler in Great Basin has held roughly steady: down 8% on the route-weighted index since 1970.

-8%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 →
79Routes 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 Black-throated Gray Warbler in Great Basin. See the full index history below.

Black-throated Gray Warbler In Great Basin Population Forecast

If the recent trend holds, Black-throated Gray Warbler in Great Basin is projected to stay roughly flat through 2030, near 0.70 (95% range 0.24–1.2). A 5-year backtest shows a typical error of ±20.9%, with 100% of held-out values landing inside the 95% band.

-4%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 →
0.70Projected 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 →
0.24–1.295% 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 →
±20.9%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, Black-throated Gray Warbler in Great Basin is projected to stay roughly flat through 2030, near 0.70 (95% range 0.24–1.2). A 5-year backtest shows a typical error of ±20.9%, with 100% 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 →
20260.690.231.2
20270.690.231.2
20280.700.231.2
20290.700.241.2
20300.700.241.2

Routes In Great Basin

Routes recording Black-throated Gray Warbler 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 →
IndexWASHINGTON201971
NewhalemWASHINGTON172025
KendallWASHINGTON142025
NewcastleUTAH132025
GlacierWASHINGTON102024
White ChuckWASHINGTON102025
Badger CreekOREGON92025
BartleCALIFORNIA82021
Big PineCALIFORNIA72025
Mt HoodOREGON72025
ConcreteWASHINGTON72025
Suiattle RivWASHINGTON62018
Humboldt NfNEVADA52015
Gold HillUTAH52025
RanchograndeNEVADA42023
Oak CityUTAH42014
Grouse CreekUTAH41982
MacdoelCALIFORNIA32012
Deep SpringsCALIFORNIA32022
IllipahNEVADA32021
WillisNEVADA32024
BuchananOREGON31972
Cascade RivWASHINGTON32006
NubieberCALIFORNIA21990
Davis CreekCALIFORNIA22022

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