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

Osprey In Coastal California

All regionsCoastal CaliforniaGeneralists

Osprey in Coastal California has surged: up 816% on the route-weighted index since 1976.

+816%Since 1976
34Routes In Region
47Years

Notable Signals

long arc increasecomputed index

Osprey has surged in Coastal California: up 816% on the route-weighted index since 1976.

Forecast

If the recent trend holds, Osprey in Coastal California is projected to stay roughly flat through 2029, near 0.42 (95% range 0.22–0.62). A 5-year backtest shows a typical error of ±123.8%, with 40% of held-out values landing inside the 95% band.

+3%Change by 2029
0.42Projected 2029 index
0.22–0.6295% range
±123.8%Backtest error
19722029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.390.190.59
20260.400.200.59
20270.400.200.60
20280.410.210.61
20290.420.220.62

Routes In Coastal California

Routes recording Osprey in Coastal California.
HughsonCALIFORNIA52024
OrovilleCALIFORNIA42024
CopperopolisCALIFORNIA42024
PenningtonCALIFORNIA22024
Morro BayCALIFORNIA21973
Point ReyesCALIFORNIA22022
Lake BerryessaCALIFORNIA22024
ArvinCALIFORNIA22015
ReddingCALIFORNIA21976
Glen Ellen 2CALIFORNIA22012
Harbor Lake 2CALIFORNIA22018
Red BluffCALIFORNIA12024
RumseyCALIFORNIA12008
Foster ParkCALIFORNIA11980
CoalingaCALIFORNIA11996
Orange CoveCALIFORNIA12016
FairfaxCALIFORNIA12019
OnoCALIFORNIA12006
FolsomCALIFORNIA12021
Sawmill MtnCALIFORNIA12013
GlennCALIFORNIA12019
TehamaCALIFORNIA11993
MoragaCALIFORNIA12016
Yolla BollyCALIFORNIA11996
Bartlett SpsCALIFORNIA12018

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