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

American Crow In Sierra Nevada

All regionsSierra NevadaGeneralists

American Crow in Sierra Nevada has risen sharply: up 52% on the route-weighted index since 1974.

+52%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 →
18Routes 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 →
52YearsYears 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 →

American Crow has risen sharply in Sierra Nevada: up 52% on the route-weighted index since 1974.

American Crow In Sierra Nevada Population Forecast

If the recent trend holds, American Crow in Sierra Nevada is projected to rise about 361% by 2030 — from 0.22 in 2025 to a central estimate of 1.0 (95% range 0.00–3.8). A 5-year backtest shows a typical error of ±86.1%, with 100% of held-out values landing inside the 95% band.

+361%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 →
1.0Projected 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 →
0.00–3.895% 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 →
±86.1%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, American Crow in Sierra Nevada is projected to rise about 361% by 2030 — from 0.22 in 2025 to a central estimate of 1.0 (95% range 0.00–3.8). A 5-year backtest shows a typical error of ±86.1%, with 100% of held-out values landing inside the 95% band.19722030
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 →
20261.00.003.8
20271.00.003.8
20281.00.003.8
20291.00.003.8
20301.00.003.8

Routes In Sierra Nevada

Routes recording American Crow 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 →
Hat CreekCALIFORNIA202016
ChilcootCALIFORNIA192024
PaxtonCALIFORNIA182024
Silver CityCALIFORNIA42003
LakeshoreCALIFORNIA31984
Greenhorn MtCALIFORNIA22006
SattleyCALIFORNIA22013
Higgins CornCALIFORNIA22025
Meadow ValleyCALIFORNIA22025
Little TruckeeCALIFORNIA22007
Forest Hill 2CALIFORNIA22005
DardanelleCALIFORNIA11980
JohnsvilleCALIFORNIA11990
WoodfordsCALIFORNIA12022
Tuolumne GroveCALIFORNIA11980
GeneseeCALIFORNIA12024
DownievilleCALIFORNIA12007
Pollock PinesCALIFORNIA11997

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