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

Pied-billed Grebe Population Trend in Iowa

All statesWetland birds

Pied-billed Grebe in Iowa has edged up: up 17% on the route-weighted index since 1973.

+17%Since 1973
13Routes In State
27Years

Notable Pied-billed Grebe Trends in Iowa

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

Pied-billed Grebe Population Forecast in Iowa

If the recent trend holds, Pied-billed Grebe in Iowa is projected to stay roughly flat through 2029, near 0.09 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±166.6%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.09Projected 2029 index
0.00–0.2595% range
±166.6%Backtest error
19702029
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
20250.090.000.25
20260.090.000.25
20270.090.000.25
20280.090.000.25
20290.090.000.25

Pied-billed Grebe Survey Routes in Iowa

Routes recording Pied-billed Grebe in Iowa.
Festina520051970
Titonka119911991
Gaza120142014
Rock Valley119931993
Brooklyn119711971
Panther120241977
Washington120171990
Hudson119841983
Zearing119901990
Scranton120181973
Pierson120171977
Sioux City120181973
Garner119921992

Pied-billed Grebe Population Trend in Other States

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

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