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Species · Colorado · BBS 2025 Release · 1966–2024

Pied-billed Grebe Population Trend in Colorado

All statesWetland birds

Pied-billed Grebe in Colorado has declined: down 27% on the route-weighted index since 1974.

-27%Since 1974
35Routes In State
42Years

Notable Pied-billed Grebe Trends in Colorado

No notable trend signals for Pied-billed Grebe in Colorado. See the full index history below.

Pied-billed Grebe Population Forecast in Colorado

If the recent trend holds, Pied-billed Grebe in Colorado is projected to stay roughly flat through 2029, near 0.07 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±138.1%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.07Projected 2029 index
0.00–0.1795% range
±138.1%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
20250.070.000.17
20260.070.000.17
20270.070.000.17
20280.070.000.17
20290.070.000.17

Pied-billed Grebe Survey Routes in Colorado

Routes recording Pied-billed Grebe in Colorado.
Cortez1020081990
Great Divide320162014
Arsenal319991991
Kiowa320161973
Last Chance220161988
Lamar219981997
Rio Grnds Rs220162002
Walden220221996
Hudson219891989
Cortez 2220172009
Steamboat L.220022002
Baxter Pass220162006
Browns Park220052003
Douglas Pass120222016
Arsenal 2120162016
Dolores119851969
Falfa119971997
Pagosa Spgs119761976
Dinosaur120171998
Lay120002000
Doyleville120061996
Nunn120182016
Fort Morgan120102009
Julesburg120131998
Alamosa120241994

Pied-billed Grebe Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniaconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwisconsinwyoming

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