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

Willet In Sierra Nevada

All regionsSierra NevadaShorebirds

Willet in Sierra Nevada has collapsed: down 91% on the route-weighted index since 1974.

-91%Since 1974
4Routes In Region
37Years

Notable Signals

long arc declinecomputed index

Willet has collapsed in Sierra Nevada: down 91% on the route-weighted index since 1974.

Forecast

If the recent trend holds, Willet in Sierra Nevada is projected to fall about 100% by 2029 — from 0.10 in 2024 to a central estimate of 0.00 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±269.9%, with 80% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–1.395% range
±269.9%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
20250.000.001.3
20260.000.001.3
20270.000.001.3
20280.000.001.3
20290.000.001.3

Routes In Sierra Nevada

Routes recording Willet in Sierra Nevada.
SattleyCALIFORNIA172017
GoumazCALIFORNIA52011
Eagle LakeCALIFORNIA22024
Hat CreekCALIFORNIA11987

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