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

Double-crested Cormorant Population Trend in Georgia

All statesWetland birds

Double-crested Cormorant in Georgia has declined: down 28% on the route-weighted index since 1984.

-28%Since 1984TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
30Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
29YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Double-crested Cormorant Trends in GeorgiaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

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

Double-crested Cormorant Population Forecast in Georgia

If the recent trend holds, Double-crested Cormorant in Georgia is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.57). A 5-year backtest shows a typical error of ±148.3%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.01Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.5795% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±148.3%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Double-crested Cormorant in Georgia is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.57). A 5-year backtest shows a typical error of ±148.3%, with 100% of held-out values landing inside the 95% band.19732029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.030.000.58
20260.030.000.58
20270.020.000.58
20280.020.000.57
20290.010.000.57

Double-crested Cormorant Survey Routes in Georgia

Routes recording Double-crested Cormorant in Georgia.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Nashville620022002
Davis Crossroads420212021
Okefenokee319911991
Siloam320191989
Darien220021973
Doles219971995
Boston220231996
Stockton120021998
Fowlstown119861986
Fitzgerald119911989
Cuthbert119831983
Crest119941994
Athens120182015
Cartersville119991999
Henderson120122012
Coffee Co119951988
Jacksonboro119941994
Macon120022002
Baxter120102010
Stockbridge120001993
Juliette119911991
Deepstep119931993
Colonels Island120152012
Rentz120112011
Wadley120081984

Double-crested Cormorant Population Trend in Other States

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

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