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

Common Raven Population Trend in Colorado

All statesGeneralists

Common Raven in Colorado has surged: up 716% on the route-weighted index since 1971.

+716%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 →
130Routes 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 ColoradoNotable 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 Colorado: up 716% on the route-weighted index since 1971.

Common Raven Population Forecast in Colorado

If the recent trend holds, Common Raven in Colorado is projected to rise about 28% by 2030 — from 5.9 in 2025 to a central estimate of 7.5 (95% range 5.4–9.6). A 5-year backtest shows a typical error of ±20.6%, with 100% of held-out values landing inside the 95% band.

+28%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 →
7.5Projected 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 →
5.4–9.695% 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 →
±20.6%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 Colorado is projected to rise about 28% by 2030 — from 5.9 in 2025 to a central estimate of 7.5 (95% range 5.4–9.6). A 5-year backtest shows a typical error of ±20.6%, with 100% of held-out values landing inside the 95% band.19692030
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 →
20267.05.09.1
20277.25.19.2
20287.35.29.3
20297.45.39.5
20307.55.49.6

Common Raven Survey Routes in Colorado

Routes recording Common Raven in Colorado.
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 →
Animas5120041996
Cortez 25020172009
Basin2920251995
Wray Gulch2820251988
Moffat2720251970
Weston Pass2620001994
Elbert2620252011
Mount Evans2320241996
San Luis2220251991
Pritchett2120171995
Guffey2020251990
Gribbles Prk1920251994
Walsenburg1820251994
Piceance Basin1820121998
Flattops1720251992
Mosca1520251992
Delta1420211974
Pleasant View1420212021
Baxter Pass1420241994
Blanca1319871981
Lay1320252004
Falfa1220251971
Browns Park1220251993
De Beque1220251992
Paonia1220251992

Common Raven Population Trend in Other States

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