BirdAnalyst
Species · BCR 32 · BBS 2026 Release · 1966–2025

Bald Eagle In Coastal California

All regionsCoastal CaliforniaBirds of prey

Bald Eagle in Coastal California has surged: up 671% on the route-weighted index since 2006.

+671%Since 2006TrendPercent 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 →
23Routes 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 →
20YearsYears 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 Bald Eagle in Coastal California. See the full index history below.

Bald Eagle In Coastal California Population Forecast

If the recent trend holds, Bald Eagle in Coastal California is projected to fall about 38% by 2030 — from 0.16 in 2025 to a central estimate of 0.10 (95% range 0.03–0.17). A 5-year backtest shows a typical error of ±68.7%, with 40% of held-out values landing inside the 95% band.

-38%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 →
0.10Projected 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 →
0.03–0.1795% 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 →
±68.7%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, Bald Eagle in Coastal California is projected to fall about 38% by 2030 — from 0.16 in 2025 to a central estimate of 0.10 (95% range 0.03–0.17). A 5-year backtest shows a typical error of ±68.7%, with 40% of held-out values landing inside the 95% band.19732030
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 →
20260.090.020.16
20270.090.020.16
20280.090.020.16
20290.100.030.17
20300.100.030.17

Routes In Coastal California

Routes recording Bald 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 BluffCALIFORNIA22018
S CatalinaCALIFORNIA22013
Lake BerryessaCALIFORNIA22025
CrestonCALIFORNIA22019
OrovilleCALIFORNIA22012
GreenfieldCALIFORNIA22025
PolomaCALIFORNIA22017
RumseyCALIFORNIA12007
HughsonCALIFORNIA12025
MorenoCALIFORNIA11973
CoalingaCALIFORNIA12022
Point ReyesCALIFORNIA12018
Cuyamaca PkCALIFORNIA12023
AdelaidaCALIFORNIA12025
GlennCALIFORNIA12015
WestleyCALIFORNIA12017
LockwoodCALIFORNIA12024
Yolla BollyCALIFORNIA12022
CoyoteCALIFORNIA12019
CopperopolisCALIFORNIA12010
OnealsCALIFORNIA12024
Lake Hemet 2CALIFORNIA12018
Hollister 2CALIFORNIA12022

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