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

Gray Partridge In Great Basin

All regionsGreat BasinGame birds

Gray Partridge in Great Basin has edged down: down 20% on the route-weighted index since 1970.

-20%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 →
67Routes 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 →
56YearsYears 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 Gray Partridge in Great Basin. See the full index history below.

Gray Partridge In Great Basin Population Forecast

If the recent trend holds, Gray Partridge in Great Basin is projected to fall about 76% by 2030 — from 0.24 in 2025 to a central estimate of 0.06 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±29.2%, with 80% of held-out values landing inside the 95% band.

-76%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 →
0.06Projected 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 →
0.00–0.2395% 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 →
±29.2%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, Gray Partridge in Great Basin is projected to fall about 76% by 2030 — from 0.24 in 2025 to a central estimate of 0.06 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±29.2%, 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 →
20260.060.000.23
20270.060.000.23
20280.060.000.23
20290.060.000.23
20300.060.000.23

Routes In Great Basin

Routes recording Gray Partridge 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 →
DuboisIDAHO102025
HarringtonWASHINGTON102004
PicaboIDAHO82014
JosephOREGON42013
PromontoryUTAH42025
Moses LakeWASHINGTON42009
KeystoneWASHINGTON42025
GiffordIDAHO32010
BakerIDAHO32019
Pasadena ValIDAHO32012
Lost RiverIDAHO32000
Humboldt Nf 2NEVADA32025
ConnellWASHINGTON31988
EwanWASHINGTON31995
LeadoreIDAHO22018
Blacks CreekIDAHO21977
RirieIDAHO22011
PocatelloIDAHO22011
Blackft ResIDAHO22016
Iron SpringsIDAHO22024
Dougal ResIDAHO22019
Daniels ResIDAHO22007
PrestonIDAHO21988
MidasNEVADA22025
JarbidgeNEVADA22012

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