BirdAnalyst
Species · Washington · BBS 2026 Release · 1966–2025

Gray Partridge Population Trend in Washington

All statesGame birds

Gray Partridge in Washington has declined: down 28% on the route-weighted index since 1971.

-28%Since 1971TrendPercent 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 →
24Routes 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 →
48YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Gray Partridge Trends in WashingtonNotable 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 Washington. See the full index history below.

Gray Partridge Population Forecast in Washington

If the recent trend holds, Gray Partridge in Washington is projected to fall about 79% by 2030 — from 0.19 in 2025 to a central estimate of 0.04 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±50.8%, with 100% of held-out values landing inside the 95% band.

-79%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 →
0.04Projected 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 →
0.00–0.2595% 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 →
±50.8%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 Washington is projected to fall about 79% by 2030 — from 0.19 in 2025 to a central estimate of 0.04 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±50.8%, 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 →
20260.050.000.27
20270.050.000.26
20280.040.000.26
20290.040.000.26
20300.040.000.25

Gray Partridge Survey Routes in Washington

Routes recording Gray Partridge in Washington.
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 →
Harrington1020041977
Moses Lake420092005
Keystone420251996
Connell319881988
Ewan319951985
Brewster220151977
Selah220012001
Reardan220241968
Tonasket219911991
Nighthawk220252015
Hartline220211999
Moses Coulee220211995
Ewan 2120252025
Mercer120181978
Asotin120251971
Sulphur120022001
Quincy119981982
Wilbur120161983
Prescott120221984
Waitsburg120012001
Malden120251998
Pomeroy120222005
Odessa120212000
Cloverland120142010

Gray Partridge Population Trend in Other States

idahoillinoisindianaiowaminnesotamontananebraskanevadanew-yorknorth-dakotaoregonsouth-dakotautahwisconsinwyoming

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