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

Double-crested Cormorant Population Trend in Washington

All statesWetland birds

Double-crested Cormorant in Washington has held roughly steady: down 7% on the route-weighted index since 1976.

-7%Since 1976
38Routes In State
45Years

Notable Double-crested Cormorant Trends in Washington

No notable trend signals for Double-crested Cormorant in Washington. See the full index history below.

Double-crested Cormorant Population Forecast in Washington

If the recent trend holds, Double-crested Cormorant in Washington is projected to rise about 549% by 2029 — from 0.26 in 2024 to a central estimate of 1.7 (95% range 0.00–4.7). A 5-year backtest shows a typical error of ±729.4%, with 100% of held-out values landing inside the 95% band.

+549%Change by 2029
1.7Projected 2029 index
0.00–4.795% range
±729.4%Backtest error
19692029
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
20251.60.004.6
20261.60.004.6
20271.70.004.6
20281.70.004.7
20291.70.004.7

Double-crested Cormorant Survey Routes in Washington

Routes recording Double-crested Cormorant in Washington.
Port Angeles4720161978
Hanford Site3919961991
South Elma2020162016
Moses Lake1220171990
Potholes620151996
Mesa620041999
Kamilche520092009
Horn Rapids520242005
Raymond520052005
Turnbull Nwr420191997
Deception319971993
Columbia Nwr320221992
Mercer320031998
Ilwaco320241993
Scootney Reservoir320192010
Malden319991999
Mukilteo320172016
Ozette219861971
Taholah220051969
Harrington220122000
Raymond 2220222022
Cusick220242017
Othello219911990
Keystone220242007
Odessa220081996

Double-crested Cormorant Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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