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

Common Raven Population Trend in Michigan

All statesGeneralists

Common Raven in Michigan has risen sharply: up 51% on the route-weighted index since 1968.

+51%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 →
60Routes 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 MichiganNotable 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 risen sharply in Michigan: up 51% on the route-weighted index since 1968.

Common Raven Population Forecast in Michigan

If the recent trend holds, Common Raven in Michigan is projected to stay roughly flat through 2030, near 4.5 (95% range 2.9–6.0). A 5-year backtest shows a typical error of ±16.3%, 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 →
4.5Projected 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 →
2.9–6.095% 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 →
±16.3%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 Michigan is projected to stay roughly flat through 2030, near 4.5 (95% range 2.9–6.0). A 5-year backtest shows a typical error of ±16.3%, 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 →
20264.32.75.8
20274.32.85.9
20284.42.85.9
20294.42.96.0
20304.52.96.0

Common Raven Survey Routes in Michigan

Routes recording Common Raven in Michigan.
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 →
Pickford2720251973
Crystal Fls2620251979
Hiawatha Nf2220251992
Sand Lake1920251992
Cluster Lakes1920102006
Scottville1820251972
Betchler Lks1820241992
Riggsville1520191974
Raco1320251971
Cunard1220211973
Frederic1220031992
Ontonagon1120191967
Wilson1120101966
Scott'S Marsh1120102006
Pine River1120211992
Cathro1020161979
Pleasant Valley 21020252004
Ishpeming820251980
Hungerford720252007
Seney Nwr720251992
Big Island Lake720102008
Bootjack620231968
Creighton620251978
Pleasant Val619971987
Imp Lake620191992

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemarylandmassachusettsminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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