BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Cooper's Hawk In Great Basin

All regionsGreat BasinGeneralists

Cooper's Hawk in Great Basin has declined: down 28% on the route-weighted index since 1971.

-28%Since 1971TrendPercent 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 →
97Routes 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 →
51YearsYears 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 Great Basin. See the full index history below.

Cooper's Hawk In Great Basin Population Forecast

If the recent trend holds, Cooper's Hawk in Great Basin is projected to fall about 51% by 2029 — from 0.10 in 2024 to a central estimate of 0.05 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±36.3%, with 80% of held-out values landing inside the 95% band.

-51%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 →
0.05Projected 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 →
0.00–0.1095% 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 →
±36.3%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, Cooper's Hawk in Great Basin is projected to fall about 51% by 2029 — from 0.10 in 2024 to a central estimate of 0.05 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±36.3%, with 80% 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 →
20250.050.000.10
20260.050.000.10
20270.050.000.10
20280.050.000.10
20290.050.000.10

Routes In Great Basin

Routes recording Cooper's Hawk in Great Basin.
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 →
PrestonIDAHO21993
Dinner StaNEVADA21968
AdrianOREGON22006
Wizard FallsOREGON22008
WapatoWASHINGTON22021
YakimaWASHINGTON22024
Lake ChelanWASHINGTON22024
RavendaleCALIFORNIA11995
Davis CreekCALIFORNIA11997
MacdoelCALIFORNIA12011
Clear Lk ResCALIFORNIA12005
BartleCALIFORNIA12017
HackamoreCALIFORNIA12006
TionestaCALIFORNIA12015
Crowder FlatCALIFORNIA12016
MadelineCALIFORNIA12001
Medicine Mtn.CALIFORNIA12021
Iron GateCALIFORNIA12009
GiffordIDAHO12017
BakerIDAHO11987
LeadoreIDAHO11979
DuboisIDAHO12008
SquirrelIDAHO12014
Blacks CreekIDAHO12001
RirieIDAHO11986

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