BirdAnalyst
Species · South Dakota · BBS 2025 Release · 1966–2024

Gray Partridge Population Trend in South Dakota

All statesGeneralists

Gray Partridge in South Dakota has edged down: down 16% on the route-weighted index since 1972.

-16%Since 1972TrendPercent 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 →
28Routes 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 →
45YearsYears 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 South DakotaNotable 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 South Dakota. See the full index history below.

Gray Partridge Population Forecast in South Dakota

If the recent trend holds, Gray Partridge in South Dakota is projected to fall about 100% by 2029 — from 0.14 in 2024 to a central estimate of 0.00 (95% range 0.00–0.63). A 5-year backtest shows a typical error of ±124.2%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–0.6395% 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 →
±124.2%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 South Dakota is projected to fall about 100% by 2029 — from 0.14 in 2024 to a central estimate of 0.00 (95% range 0.00–0.63). A 5-year backtest shows a typical error of ±124.2%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20250.000.000.63
20260.000.000.63
20270.000.000.63
20280.000.000.63
20290.000.000.63

Gray Partridge Survey Routes in South Dakota

Routes recording Gray Partridge in South Dakota.
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 →
Conde1119841983
Forbes619861978
Howard520071971
Lodgepole320172004
Eagle Butte320061999
Turton319851985
Tripp220191971
Railroad Butte220112011
Wilmot219831967
Veblen219851977
Britton220041974
Gettysburg219921974
Long Lake219871972
Laplant219751975
Owanka220221985
Gorman220101995
Maurine220242023
Lennox120091971
White Lake119931980
Geddes119881988
Cottonwood120242024
Volga120061972
Raymond120061983
Roswell119941980
Broadland119891989

Gray Partridge Population Trend in Other States

idahoillinoisindianaiowaminnesotamontananebraskanevadanew-yorknorth-dakotaoregonutahwashingtonwisconsinwyoming

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