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Species · Michigan · BBS 2025 Release · 1966–2024

Double-crested Cormorant Population Trend in Michigan

All statesWetland birds

Double-crested Cormorant in Michigan has fallen sharply: down 69% on the route-weighted index since 1991.

-69%Since 1991
15Routes In State
22Years

Notable Double-crested Cormorant Trends in Michigan

long arc declinecomputed index

Double-crested Cormorant has fallen sharply in Michigan: down 69% on the route-weighted index since 1991.

Double-crested Cormorant Population Forecast in Michigan

If the recent trend holds, Double-crested Cormorant in Michigan is projected to fall about 92% by 2029 — from 0.06 in 2024 to a central estimate of 0.01 (95% range 0.00–0.30). A 5-year backtest shows a typical error of ±183.9%, with 100% of held-out values landing inside the 95% band.

-92%Change by 2029
0.01Projected 2029 index
0.00–0.3095% range
±183.9%Backtest error
19882029
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
20250.020.000.32
20260.020.000.31
20270.010.000.31
20280.010.000.30
20290.010.000.30

Double-crested Cormorant Survey Routes in Michigan

Routes recording Double-crested Cormorant in Michigan.
Isabella519881988
St Charles420181991
Bootjack319981992
Maple Grove219921992
Ishpeming219911990
Big Blue Lk220242013
Cathro219951995
Galesburg120102010
Hungerford120122012
Herman119931991
Deckerville120042004
Pickford120002000
Richmond120242024
Muskallonge119971997
Prattville120022002

Double-crested Cormorant Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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