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

Common Raven Population Trend in Wisconsin

All statesGeneralists

Common Raven in Wisconsin has surged: up 237% on the route-weighted index since 1968.

+237%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 →
62Routes 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 →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Raven 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 increasecomputed 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 →

Common Raven has surged in Wisconsin: up 237% on the route-weighted index since 1968.

Common Raven Population Forecast in Wisconsin

If the recent trend holds, Common Raven in Wisconsin is projected to stay roughly flat through 2029, near 2.8 (95% range 1.9–3.6). A 5-year backtest shows a typical error of ±13.4%, with 100% of held-out values landing inside the 95% band.

-0%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 →
2.8Projected 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 →
1.9–3.695% 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 →
±13.4%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 Raven in Wisconsin is projected to stay roughly flat through 2029, near 2.8 (95% range 1.9–3.6). A 5-year backtest shows a typical error of ±13.4%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20252.71.83.5
20262.71.83.5
20272.71.93.6
20282.71.93.6
20292.81.93.6

Common Raven Survey Routes in Wisconsin

Routes recording Common Raven 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 →
Amberg2120241980
Conover2020241998
Mather1320231980
Flambeau1220241998
Grand View1120241967
Union Twp1120241971
Gilman1120241969
Gresham1020241998
Eagle River820241966
Wausaukee820241980
Land O' Lakes 2820242017
Cumberland720241972
Popple River720241966
Amnicon Falls720241998
Cadott620241977
Stevens Pt620221978
Weirgor Springs620242000
Cavour620241998
Chaffey520241966
Weyerhauser520241978
Phillips520241966
Casco520231994
Stetsonville520241990
Bayfield420241967
Land O Lakes420161967

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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