BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Wood Duck In Sierra Nevada

All regionsSierra NevadaWaterfowl

Wood Duck in Sierra Nevada has fallen sharply: down 74% on the route-weighted index since 1985.

-74%Since 1985
6Routes In Region
23Years

Notable Signals

long arc declinecomputed index

Wood Duck has fallen sharply in Sierra Nevada: down 74% on the route-weighted index since 1985.

Forecast

If the recent trend holds, Wood Duck in Sierra Nevada is projected to rise about 125% by 2024 — from 0.08 in 2019 to a central estimate of 0.18 (95% range 0.00–0.46). A 5-year backtest shows a typical error of ±269.4%, with 100% of held-out values landing inside the 95% band.

+125%Change by 2024
0.18Projected 2024 index
0.00–0.4695% range
±269.4%Backtest error
19772024
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
20200.180.000.47
20210.180.000.47
20220.180.000.47
20230.180.000.46
20240.180.000.46

Routes In Sierra Nevada

Routes recording Wood Duck in Sierra Nevada.
Bass LakeCALIFORNIA51977
GeneseeCALIFORNIA32015
PaxtonCALIFORNIA22019
Tuolumne GroveCALIFORNIA12016
Higgins CornCALIFORNIA12013
Hat CreekCALIFORNIA11997

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