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

Ruddy Duck In Coastal California

All regionsCoastal CaliforniaWaterfowl

Ruddy Duck in Coastal California has declined: down 44% on the route-weighted index since 1973.

-44%Since 1973
31Routes In Region
51Years

Notable Signals

No notable trend signals for Ruddy Duck in Coastal California. See the full index history below.

Forecast

If the recent trend holds, Ruddy Duck in Coastal California is projected to fall about 51% by 2029 — from 0.23 in 2024 to a central estimate of 0.12 (95% range 0.00–0.40). A 5-year backtest shows a typical error of ±117.5%, with 100% of held-out values landing inside the 95% band.

-51%Change by 2029
0.12Projected 2029 index
0.00–0.4095% range
±117.5%Backtest error
19702029
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
20250.120.000.41
20260.120.000.41
20270.120.000.41
20280.120.000.41
20290.120.000.40

Routes In Coastal California

Routes recording Ruddy Duck in Coastal California.
Mark WestCALIFORNIA151978
AdelaidaCALIFORNIA102015
CollegevilleCALIFORNIA91987
AnzaCALIFORNIA71975
LockwoodCALIFORNIA62023
Buena VistaCALIFORNIA62019
Jofegan 2CALIFORNIA62024
Foster ParkCALIFORNIA51975
S CatalinaCALIFORNIA51998
Ora LomaCALIFORNIA51995
Big BearCALIFORNIA41986
Cp. PendletonCALIFORNIA41991
JacumbaCALIFORNIA41995
Carrizo PlnCALIFORNIA41978
PescaderoCALIFORNIA32024
Tres PinosCALIFORNIA22000
OilfieldsCALIFORNIA21976
HollisterCALIFORNIA21993
CoalingaCALIFORNIA21999
Elizabeth LkCALIFORNIA21985
CordovaCALIFORNIA21981
WestleyCALIFORNIA21993
TehamaCALIFORNIA21997
PolomaCALIFORNIA22024
HughsonCALIFORNIA12023

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