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

Common Raven Population Trend in California

All statesGeneralists

Common Raven in California has surged: up 81% on the route-weighted index since 1970.

+81%Since 1970TrendPercent 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 →
258Routes 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 CaliforniaNotable 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 California: up 81% on the route-weighted index since 1970.

Common Raven Population Forecast in California

If the recent trend holds, Common Raven in California is projected to rise about 19% by 2029 — from 12 in 2024 to a central estimate of 14 (95% range 11–17). A 5-year backtest shows a typical error of ±3.8%, with 100% of held-out values landing inside the 95% band.

+19%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 →
14Projected 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 →
11–1795% 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 →
±3.8%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 California is projected to rise about 19% by 2029 — from 12 in 2024 to a central estimate of 14 (95% range 11–17). A 5-year backtest shows a typical error of ±3.8%, with 100% of held-out values landing inside the 95% band.19682029
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 →
2025131016
2026131016
2027131017
2028141117
2029141117

Common Raven Survey Routes in California

Routes recording Common Raven in California.
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 →
Moreno10420241969
Willow Spgs9019811968
Carrizo Pln8220231970
South Lake7520062006
Ventucopa5920021972
Lockwood Val5020191970
Oak Grove4820241968
Oilfields4520131978
Calif City4520151977
Jacumba4420241973
Barstow4119981969
Elizabeth Lk4120161970
Bakersfield3920231968
Tracy 23820242010
Buena Vista3720191990
Haiwee Res3620051975
Anza 23320242005
Willow Springs 23220242013
Dorris3120191983
Tres Pinos 23120112005
Parkfield2920241968
Creston2920241974
Navarro2720111972
Anza2720041970
Tracy2720091992

Common Raven Population Trend in Other States

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

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