BirdAnalyst
Species · BCR 15 · BBS 2026 Release · 1966–2025

Common Raven In Sierra Nevada

All regionsSierra NevadaGeneralists

Common Raven in Sierra Nevada has surged: up 31× on the route-weighted index since 1973.

31×Since 1973TrendPercent 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 →
37Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
53YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Sierra Nevada: up 31× on the route-weighted index since 1973.

Common Raven In Sierra Nevada Population Forecast

If the recent trend holds, Common Raven in Sierra Nevada is projected to fall about 17% by 2030 — from 8.3 in 2025 to a central estimate of 6.9 (95% range 5.3–8.4). A 5-year backtest shows a typical error of ±17.4%, with 40% of held-out values landing inside the 95% band.

-17%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 →
6.9Projected 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 →
5.3–8.495% 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 →
±17.4%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 Sierra Nevada is projected to fall about 17% by 2030 — from 8.3 in 2025 to a central estimate of 6.9 (95% range 5.3–8.4). A 5-year backtest shows a typical error of ±17.4%, with 40% of held-out values landing inside the 95% band.19712030
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 →
20266.44.87.9
20276.55.08.0
20286.65.18.1
20296.75.28.3
20306.95.38.4

Routes In Sierra Nevada

Routes recording Common Raven in Sierra Nevada.
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 →
Higgins CornCALIFORNIA312025
Greenhorn MtCALIFORNIA162008
Bass LakeCALIFORNIA152019
WawonaCALIFORNIA142025
WestvilleCALIFORNIA122025
WoodfordsCALIFORNIA122025
Butte MeadowCALIFORNIA122014
Pollock PinesCALIFORNIA122025
SattleyCALIFORNIA102025
Little TruckeeCALIFORNIA102025
Tuolumne GroveCALIFORNIA92025
Meadow ValleyCALIFORNIA82024
LumberyardCALIFORNIA72025
GeneseeCALIFORNIA72024
RivertonCALIFORNIA72022
LakeshoreCALIFORNIA72024
PlacervilleCALIFORNIA72025
DownievilleCALIFORNIA62025
GoumazCALIFORNIA62011
Silver CityCALIFORNIA52013
Eagle LakeCALIFORNIA42025
JohnsvilleCALIFORNIA42025
Hat CreekCALIFORNIA42018
PaxtonCALIFORNIA42025
CoultervilleCALIFORNIA42019

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