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Species · Michigan · BBS 2025 Release · 1966–2024

Common Raven Population Trend in Michigan

All statesGeneralists

Common Raven in Michigan has increased: up 32% on the route-weighted index since 1968.

+32%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 →
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 MichiganNotable 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 Common Raven in Michigan. See the full index history below.

Common Raven Population Forecast in Michigan

If the recent trend holds, Common Raven in Michigan is projected to rise about 18% by 2029 — from 3.7 in 2024 to a central estimate of 4.4 (95% range 2.8–5.9). A 5-year backtest shows a typical error of ±15.5%, with 100% of held-out values landing inside the 95% band.

+18%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 →
4.4Projected 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 →
2.8–5.995% 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 →
±15.5%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 rise about 18% by 2029 — from 3.7 in 2024 to a central estimate of 4.4 (95% range 2.8–5.9). A 5-year backtest shows a typical error of ±15.5%, 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 →
20254.22.65.7
20264.22.75.8
20274.32.75.8
20284.32.85.9
20294.42.85.9

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 →
Hiawatha Nf3420241992
Sand Lake2320241992
Cluster Lakes1920102006
Betchler Lks1820241992
Skegemog Pt1520241980
Raco1520241971
Riggsville1520191974
Cunard1220211973
Pickford1220241973
Frederic1220031992
Ontonagon1120191967
Wilson1120101966
Creighton1120231978
Scott'S Marsh1120102006
Pine River1120211992
Cathro1020161979
Maple Grove820241967
Big Island Lake720102008
Bootjack620231968
Pleasant Val619971987
Imp Lake620191992
Ensign620102006
Isabella 2620232013
Harrietta520241990
Ned Lake520241986

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 2026-05-22.