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

Double-crested Cormorant Population Trend in Oklahoma

All statesWetland birds

Double-crested Cormorant in Oklahoma has surged: up 720% on the route-weighted index since 1990.

+720%Since 1990
12Routes In State
22Years

Notable Double-crested Cormorant Trends in Oklahoma

long arc increasecomputed index

Double-crested Cormorant has surged in Oklahoma: up 720% on the route-weighted index since 1990.

Double-crested Cormorant Population Forecast in Oklahoma

If the recent trend holds, Double-crested Cormorant in Oklahoma is projected to fall about 64% by 2029 — from 0.69 in 2024 to a central estimate of 0.25 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±133.7%, with 80% of held-out values landing inside the 95% band.

-64%Change by 2029
0.25Projected 2029 index
0.00–0.5295% range
±133.7%Backtest error
19822029
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
20250.230.000.50
20260.230.000.50
20270.240.000.51
20280.240.000.51
20290.250.000.52

Double-crested Cormorant Survey Routes in Oklahoma

Routes recording Double-crested Cormorant in Oklahoma.
Jet2020241995
Wainwright919971992
Felt320162016
Erick320192018
Wichita Mts West220152015
Big Cedar119831983
Blanco119931990
Hunter120162016
Pushmataha120172017
Cooperton120172017
Collinsville119821982
Arapaho120022002

Double-crested Cormorant Population Trend in Other States

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

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