BirdAnalyst
Species · BCR 12 · BBS 2026 Release · 1966–2025

Common Raven In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionGeneralists

Common Raven in Boreal Hardwood Transition has surged: up 103% on the route-weighted index since 1968.

+103%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 →
125Routes In RegionSurvey 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 SignalsNotable 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 Boreal Hardwood Transition: up 103% on the route-weighted index since 1968.

Common Raven In Boreal Hardwood Transition Population Forecast

If the recent trend holds, Common Raven in Boreal Hardwood Transition is projected to stay roughly flat through 2030, near 7.2 (95% range 5.7–8.6). A 5-year backtest shows a typical error of ±8.9%, with 100% of held-out values landing inside the 95% band.

+7%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 →
7.2Projected 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 →
5.7–8.695% 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 →
±8.9%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 Boreal Hardwood Transition is projected to stay roughly flat through 2030, near 7.2 (95% range 5.7–8.6). A 5-year backtest shows a typical error of ±8.9%, 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 →
20266.95.48.3
20276.95.58.4
20287.05.68.4
20297.15.78.5
20307.25.78.6

Routes In Boreal Hardwood Transition

Routes recording Common Raven in Boreal Hardwood Transition.
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 →
PickfordMICHIGAN272025
Crystal FlsMICHIGAN262025
Hiawatha NfMICHIGAN222025
LudeMINNESOTA202025
ConoverWISCONSIN202025
Sand LakeMICHIGAN192025
Cluster LakesMICHIGAN192010
Betchler LksMICHIGAN182024
FloodwoodMINNESOTA162025
NebishMINNESOTA162025
Weirgor SpringsWISCONSIN162025
RiggsvilleMICHIGAN152019
RacoMICHIGAN132025
Island LakeMINNESOTA132017
BashawWISCONSIN132025
CunardMICHIGAN122021
FredericMICHIGAN122003
WausaukeeWISCONSIN122025
OntonagonMICHIGAN112019
WilsonMICHIGAN112010
Pine RiverMICHIGAN112021
Scott'S MarshMICHIGAN112010
GlendaleMINNESOTA112025
CathroMICHIGAN102016
Pleasant Valley 2MICHIGAN102025

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