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

Double-crested Cormorant Population Trend in Oregon

All statesWetland birds

Double-crested Cormorant in Oregon has fallen sharply: down 72% on the route-weighted index since 1971.

-72%Since 1971
23Routes In State
55Years

Notable Double-crested Cormorant Trends in Oregon

long arc declinecomputed index

Double-crested Cormorant has fallen sharply in Oregon: down 71% on the route-weighted index since 1971.

Double-crested Cormorant Population Forecast in Oregon

If the recent trend holds, Double-crested Cormorant in Oregon is projected to rise about 20% by 2029 — from 0.32 in 2024 to a central estimate of 0.39 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±106.8%, with 100% of held-out values landing inside the 95% band.

+20%Change by 2029
0.39Projected 2029 index
0.00–1.695% range
±106.8%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
20250.430.001.7
20260.420.001.7
20270.410.001.7
20280.400.001.6
20290.390.001.6

Double-crested Cormorant Survey Routes in Oregon

Routes recording Double-crested Cormorant in Oregon.
Glasgow2420241989
Princeton819851978
Malheur Nwr719981986
Dell Spring519891980
Elk Lake520161982
Nicolai Mtn.320241994
Modoc Point320181969
Wedderburn220241970
Barnes Val219741974
Clearwater220021991
Fish Lake220151987
Green220232023
Catlow Rim220162004
Lapham Res.120062006
Elkton119951995
Hazel Camp120221975
Emigrant Lk119861986
Blizzard Gap120161989
Coquille120242016
Harney Lake119971993
Warner Vally120211996
Sheaville120222013
Chinchalo120051995

Double-crested Cormorant Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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