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

Chihuahuan Raven Population Trend in Colorado

All statesGeneralists

Chihuahuan Raven in Colorado has surged: up 285% on the route-weighted index since 1974.

+285%Since 1974TrendPercent 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 →
20Routes 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 →
47YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Chihuahuan 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 →

Chihuahuan Raven has surged in Colorado: up 285% on the route-weighted index since 1974.

Chihuahuan Raven Population Forecast in Colorado

If the recent trend holds, Chihuahuan Raven in Colorado is projected to rise about 13% by 2029 — from 0.43 in 2024 to a central estimate of 0.49 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±37.3%, with 100% of held-out values landing inside the 95% band.

+13%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 →
0.49Projected 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 →
0.00–1.195% 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 →
±37.3%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, Chihuahuan Raven in Colorado is projected to rise about 13% by 2029 — from 0.43 in 2024 to a central estimate of 0.49 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±37.3%, with 100% of held-out values landing inside the 95% band.19722029
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 →
20250.470.001.1
20260.470.001.1
20270.480.001.1
20280.480.001.1
20290.490.001.1

Chihuahuan Raven Survey Routes in Colorado

Routes recording Chihuahuan 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 →
Campo2020191988
Pritchett1520241999
Gilpin1420241972
Timpas1020191995
Edler920231992
Doyle Bridge 2720222013
Crowley720232003
Lamar620241988
Villegreen620191988
Two Buttes520151973
Ninaview520121996
Trinchera320212018
Sheridan Lak320132013
Haswell220241995
Neegrande220232023
Gardner220241998
Cone Mtn220241989
Rush120241983
Cheyenne119981998
Karval120142014

Chihuahuan Raven Population Trend in Other States

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