BirdAnalyst
Species · Washington · BBS 2025 Release · 1966–2024

Pigeon Guillemot Population Trend in Washington

All statesGeneralists

Pigeon Guillemot in Washington has fallen sharply: down 69% on the route-weighted index since 1973.

-69%Since 1973
8Routes In State
47Years

Notable Pigeon Guillemot Trends in Washington

long arc declinecomputed index

Pigeon Guillemot has fallen sharply in Washington: down 69% on the route-weighted index since 1973.

Pigeon Guillemot Population Forecast in Washington

If the recent trend holds, Pigeon Guillemot in Washington is projected to fall about 77% by 2029 — from 0.09 in 2024 to a central estimate of 0.02 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±70.5%, with 100% of held-out values landing inside the 95% band.

-77%Change by 2029
0.02Projected 2029 index
0.00–0.2595% range
±70.5%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
20250.040.000.27
20260.030.000.27
20270.030.000.26
20280.030.000.26
20290.020.000.25

Pigeon Guillemot Survey Routes in Washington

Routes recording Pigeon Guillemot in Washington.
Deception1119981992
Ilwaco419931993
Ozette319831971
Port Angeles320241970
Warm Beach 2220242018
Mukilteo220212016
Warm Beach120161985
Vashon Is.120192000

Pigeon Guillemot Population Trend in Other States

alaskacaliforniaoregon

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