BirdAnalyst
Species · Wisconsin · BBS 2025 Release · 1966–2024

Gray Partridge Population Trend in Wisconsin

All statesGeneralists

Gray Partridge in Wisconsin has collapsed: down 78% on the route-weighted index since 1968.

-78%Since 1968TrendPercent 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 →
17Routes 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 →
32YearsYears 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 WisconsinNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Gray Partridge has collapsed in Wisconsin: down 78% on the route-weighted index since 1968.

Gray Partridge Population Forecast in Wisconsin

If the recent trend holds, Gray Partridge in Wisconsin is projected to stay roughly flat through 2018, near 0.01 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±191%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2018TrendPercent 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 →
0.01Projected 2018 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1095% 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 →
±191%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 Wisconsin is projected to stay roughly flat through 2018, near 0.01 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±191%, with 100% of held-out values landing inside the 95% band.19662018
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 →
20140.020.000.10
20150.020.000.10
20160.010.000.10
20170.010.000.10
20180.010.000.10

Gray Partridge Survey Routes in Wisconsin

Routes recording Gray Partridge in Wisconsin.
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 →
Beaver Dam819931979
Rolling Pr319741974
Hazel Green220131974
Wiota219901973
Raymond219691969
Manitowoc219811967
Newburg Crns219781978
Pt Washingtn220021968
N Andover119891980
Kiel120072007
Manawa119861966
Omro119821968
Clintonville119741968
Casco120001966
N Freedom119841984
Brownsville119931974
Eden119881974

Gray Partridge Population Trend in Other States

idahoillinoisindianaiowaminnesotamontananebraskanevadanew-yorknorth-dakotaoregonsouth-dakotautahwashingtonwyoming

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