BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Common Raven Population Trend in Colorado

All statesGeneralists

Common Raven in Colorado has surged: up 717% on the route-weighted index since 1971.

+717%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 →
127Routes 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 →
55YearsYears 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 717% 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 21% by 2029 — from 6.2 in 2024 to a central estimate of 7.5 (95% range 5.4–9.6). A 5-year backtest shows a typical error of ±23.1%, with 100% of held-out values landing inside the 95% band.

+21%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 →
7.5Projected 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 →
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 →
±23.1%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 21% by 2029 — from 6.2 in 2024 to a central estimate of 7.5 (95% range 5.4–9.6). A 5-year backtest shows a typical error of ±23.1%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20257.04.99.1
20267.15.09.2
20277.25.29.3
20287.45.39.4
20297.55.49.6

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
San Luis4520241991
Moffat3920241970
Mesita3220242005
Weston Pass2620001994
Angora2520241998
Basin2420241995
Mount Evans2320241996
Pritchett2120171995
Westcliffe2020241998
Deadman Rd.1820241992
Piceance Basin1820121998
Blackhead Pk1620211991
Guffey1520241990
Paonia1520241992
Delta1420211974
Pleasant View1420212021
Buffalo Park1420231992
Baxter Pass1420241994
Blanca1319871981
Pinon1320241992
Rifle Falls1320211998
Black Sulphur Cr1320242015
Wray Gulch1220231988

Common Raven Population Trend in Other States

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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.