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

Common Raven Population Trend in Wisconsin

All statesGeneralists

Common Raven in Wisconsin has surged: up 250% on the route-weighted index since 1968.

+250%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 →
65Routes 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 →
59YearsYears 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 250% 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 2030, near 2.8 (95% range 1.9–3.6). A 5-year backtest shows a typical error of ±9.6%, with 100% of held-out values landing inside the 95% band.

+4%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 →
2.8Projected 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 →
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 →
±9.6%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 2030, near 2.8 (95% range 1.9–3.6). A 5-year backtest shows a typical error of ±9.6%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20262.71.83.5
20272.71.93.5
20282.71.93.6
20292.81.93.6
20302.81.93.6

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 →
Conover2020251998
Weirgor Springs1620252000
Mather1320231980
Bashaw1320251998
Wausaukee1220251980
Rib Lake1020251966
Amnicon Falls920251998
Eagle River820241966
Phillips720251966
Amberg720251980
Flambeau720251998
Union Twp620251971
Loraine620251966
Irma620251967
Stevens Pt620221978
Cavour620251998
Chaffey520251966
Cumberland520251972
Cadott520251977
Casco520231994
Minong420251970
Bayfield420251967
Montreal420251968
Land O Lakes420161967
Mcnaughton420241966

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 2026-08-14.