BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Golden Eagle In Coastal California

All regionsCoastal CaliforniaGeneralists

Golden Eagle in Coastal California has fallen sharply: down 52% on the route-weighted index since 1972.

-52%Since 1972TrendPercent 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 →
57Routes 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 declinecomputed 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 →

Golden Eagle has fallen sharply in Coastal California: down 52% on the route-weighted index since 1972.

Golden Eagle In Coastal California Population Forecast

If the recent trend holds, Golden Eagle in Coastal California is projected to rise about 61% by 2029 — from 0.06 in 2024 to a central estimate of 0.10 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±157.1%, with 100% of held-out values landing inside the 95% band.

+61%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 →
0.10Projected 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 →
0.00–0.2295% 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 →
±157.1%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, Golden Eagle in Coastal California is projected to rise about 61% by 2029 — from 0.06 in 2024 to a central estimate of 0.10 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±157.1%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.100.000.22
20260.100.000.22
20270.100.000.22
20280.100.000.22
20290.100.000.22

Routes In Coastal California

Routes recording Golden Eagle in Coastal 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 →
Red BluffCALIFORNIA22004
CalpellaCALIFORNIA21981
Tres PinosCALIFORNIA22002
CohassetCALIFORNIA21979
Carmel ValCALIFORNIA22023
Green ValleyCALIFORNIA22014
CoyoteCALIFORNIA22024
Glen EllenCALIFORNIA21989
Cal Hot SpgsCALIFORNIA22019
Tracy 2CALIFORNIA22016
PenningtonCALIFORNIA12015
RumseyCALIFORNIA12006
RiovistaCALIFORNIA12005
HughsonCALIFORNIA12006
Yokohl ValCALIFORNIA11976
ParkfieldCALIFORNIA11978
BakersfieldCALIFORNIA11969
Santa YnezCALIFORNIA11986
Mt PinosCALIFORNIA11982
MorenoCALIFORNIA11986
CoalingaCALIFORNIA12022
Orange CoveCALIFORNIA12010
Morro BayCALIFORNIA12012
OrlandCALIFORNIA12003
OnoCALIFORNIA12005

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