BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Cooper's Hawk In Sierra Nevada

All regionsSierra NevadaGeneralists

Cooper's Hawk in Sierra Nevada has declined: down 48% on the route-weighted index since 1977.

-48%Since 1977TrendPercent 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 RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
32YearsYears 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 →

No notable trend signals for Cooper's Hawk in Sierra Nevada. See the full index history below.

Cooper's Hawk In Sierra Nevada Population Forecast

If the recent trend holds, Cooper's Hawk in Sierra Nevada is projected to fall about 41% by 2028 — from 0.06 in 2023 to a central estimate of 0.04 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±24%, with 100% of held-out values landing inside the 95% band.

-41%Change by 2028TrendPercent 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 →
0.04Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1195% 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 →
±24%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, Cooper's Hawk in Sierra Nevada is projected to fall about 41% by 2028 — from 0.06 in 2023 to a central estimate of 0.04 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±24%, with 100% of held-out values landing inside the 95% band.19722028
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 →
20240.040.000.12
20250.040.000.11
20260.040.000.11
20270.040.000.11
20280.040.000.11

Routes In Sierra Nevada

Routes recording Cooper's Hawk 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 →
Eagle LakeCALIFORNIA12003
WestvilleCALIFORNIA12022
Bass LakeCALIFORNIA12019
JohnsvilleCALIFORNIA11978
LumberyardCALIFORNIA12005
Greenhorn MtCALIFORNIA12008
Silver CityCALIFORNIA12012
Kings CanyonCALIFORNIA11988
Tuolumne GroveCALIFORNIA11998
SattleyCALIFORNIA12017
GeneseeCALIFORNIA11993
Higgins CornCALIFORNIA12006
DownievilleCALIFORNIA12014
RivertonCALIFORNIA12010
Hat CreekCALIFORNIA12007
Meadow ValleyCALIFORNIA12023
Little TruckeeCALIFORNIA12008
Forest HillCALIFORNIA12004
WawonaCALIFORNIA12015
StrawberryCALIFORNIA11999

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