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

Common Raven Population Trend in Idaho

All statesGeneralists

Common Raven in Idaho has surged: up 275% on the route-weighted index since 1971.

+275%Since 1971TrendPercent 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 →
66Routes 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 →
56YearsYears 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 IdahoNotable 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 Idaho: up 275% on the route-weighted index since 1971.

Common Raven Population Forecast in Idaho

If the recent trend holds, Common Raven in Idaho is projected to stay roughly flat through 2030, near 10 (95% range 6.2–14). A 5-year backtest shows a typical error of ±28.7%, with 60% 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 →
10Projected 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 →
6.2–1495% 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 →
±28.7%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 Idaho is projected to stay roughly flat through 2030, near 10 (95% range 6.2–14). A 5-year backtest shows a typical error of ±28.7%, with 60% of held-out values landing inside the 95% band.19682030
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 →
20269.75.614
20279.85.714
2028105.914
2029106.014
2030106.214

Common Raven Survey Routes in Idaho

Routes recording Common Raven in Idaho.
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 →
Tractor Flat10420251987
Dubois2820251982
Almo2720251988
Coolin2420251986
Naples2320251973
Blacks Creek1720171968
Craters1620181981
Twin Buttes1420251985
Mud Lake1420252006
Golden1320161987
Acequia1320121987
Mivoden1220251977
Nezperce1220121968
Lolo Pass1220191992
Circular Bu1220251988
Blackft Res1120181985
N Fork Cda R1020191993
Daniels Res1020251989
Glenns Ferry919861968
Carey920181989
Hot Spring920251988
Cedar Hill920241989
Grangeville820251986
Cape Horn820251986
Magic Mtn820251987

Common Raven Population Trend in Other States

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

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