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

American Crow Population Trend in Maine

All statesGeneralists

American Crow in Maine has risen sharply: up 56% on the route-weighted index since 1968.

+56%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 →
77Routes 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 American Crow Trends in MaineNotable 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 →

American Crow has risen sharply in Maine: up 56% on the route-weighted index since 1968.

American Crow Population Forecast in Maine

If the recent trend holds, American Crow in Maine is projected to rise about 34% by 2030 — from 25 in 2025 to a central estimate of 33 (95% range 26–40). A 5-year backtest shows a typical error of ±13.4%, with 80% of held-out values landing inside the 95% band.

+34%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 →
33Projected 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 →
26–4095% 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, American Crow in Maine is projected to rise about 34% by 2030 — from 25 in 2025 to a central estimate of 33 (95% range 26–40). A 5-year backtest shows a typical error of ±13.4%, with 80% 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 →
2026322540
2027322540
2028332540
2029332640
2030332640

American Crow Survey Routes in Maine

Routes recording American Crow in Maine.
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 →
Ft Fairfield7420051993
Castine7220061976
Ashland5720081980
Boundary5620161993
Washburn4920051979
St David4820051982
Manchester4719951971
Westbrook4520241977
Otisfield Gr4420151966
Benton4319801971
East Troy4220211972
Harmony4120251967
Hancock4120251969
Deblois4120071966
Hudson4120161973
Eastbrook4020251971
Turner 24020252011
Bowdoin Ctr3920211971
Charleston3920211975
Greenville3920221972
Cambridge3920141967
Newcastle3720241971
Kittery Pt3620251966
Turner3520101972
Ludlow3419981968

American Crow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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