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

Pelagic Cormorant Population Trend in Washington

All statesWetland birds

Pelagic Cormorant in Washington has fallen sharply: down 53% on the route-weighted index since 1971.

-53%Since 1971
4Routes In State
33Years

Notable Pelagic Cormorant Trends in Washington

long arc declinecomputed index

Pelagic Cormorant has fallen sharply in Washington: down 53% on the route-weighted index since 1971.

Pelagic Cormorant Population Forecast in Washington

If the recent trend holds, Pelagic Cormorant in Washington is projected to stay roughly flat through 2027, near 1.0 (95% range 0.00–3.2). A 5-year backtest shows a typical error of ±5263.3%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2027
1.0Projected 2027 index
0.00–3.295% range
±5263.3%Backtest error
19692027
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
20231.00.003.2
20241.00.003.2
20251.00.003.2
20261.00.003.2
20271.00.003.2

Pelagic Cormorant Survey Routes in Washington

Routes recording Pelagic Cormorant in Washington.
Ozette319871974
Taholah220221969
Ilwaco120181992
Port Angeles120091981

Pelagic Cormorant Population Trend in Other States

alaskacaliforniaoregon

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