BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Common Poorwill In Great Basin

All regionsGreat BasinAerial insectivores

Common Poorwill in Great Basin has held roughly steady: down 3% on the route-weighted index since 1970.

-3%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 →
91Routes 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 →
54YearsYears 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 Common Poorwill in Great Basin. See the full index history below.

Common Poorwill In Great Basin Population Forecast

If the recent trend holds, Common Poorwill in Great Basin is projected to stay roughly flat through 2029, near 0.09 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±38.7%, with 100% of held-out values landing inside the 95% band.

-2%Change 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 →
0.09Projected 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 →
0.00–0.1995% 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 →
±38.7%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, Common Poorwill in Great Basin is projected to stay roughly flat through 2029, near 0.09 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±38.7%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.090.000.19
20260.090.000.19
20270.090.000.19
20280.090.000.19
20290.090.000.19

Routes In Great Basin

Routes recording Common Poorwill 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 →
Big PineCALIFORNIA41999
Twin ButtesIDAHO42001
Lost RiverIDAHO41995
Bald Mtn.NEVADA42023
AlmoIDAHO32000
Dobbin CreekNEVADA31970
Flook LakeOREGON32024
TonasketWASHINGTON31983
Crowley LakeCALIFORNIA21983
Clear Lk ResCALIFORNIA22000
RanchograndeNEVADA22016
EurekaNEVADA21998
GardnervilleNEVADA21997
Gardnerville 2NEVADA22024
CrowleyOREGON22022
Alvord LakeOREGON22006
EightmileOREGON21993
Green Mtn.OREGON22022
Oak CityUTAH21990
Iron SpringsUTAH21992
TwispWASHINGTON21991
MazamaWASHINGTON22001
NubieberCALIFORNIA12018
BentonCALIFORNIA12016
BodieCALIFORNIA12014

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