Species · Indiana · BBS 2025 Release · 1966–2024
Pied-billed Grebe Population Trend in Indiana
Pied-billed Grebe in Indiana has collapsed: down 82% on the route-weighted index since 1968.
-82%Since 1968
13Routes In State
20Years
Notable Pied-billed Grebe Trends in Indiana
long arc declinecomputed index
Pied-billed Grebe has collapsed in Indiana: down 82% on the route-weighted index since 1968.
Pied-billed Grebe Population Forecast in Indiana
If the recent trend holds, Pied-billed Grebe in Indiana is projected to stay roughly flat through 2028, near 0.00 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±84.6%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2028
0.00Projected 2028 index
0.00–0.1495% range
±84.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.00 | 0.00 | 0.14 |
| 2025 | 0.00 | 0.00 | 0.14 |
| 2026 | 0.00 | 0.00 | 0.14 |
| 2027 | 0.00 | 0.00 | 0.14 |
| 2028 | 0.00 | 0.00 | 0.14 |
Pied-billed Grebe Survey Routes in Indiana
| Columbia Cty | 4 | 1998 | 1991 |
| Gary | 3 | 1981 | 1980 |
| Hebron | 1 | 1968 | 1968 |
| Cumback | 1 | 1968 | 1968 |
| Knox | 1 | 2012 | 2012 |
| Portage | 1 | 2000 | 2000 |
| Indiana Dune | 1 | 2002 | 1996 |
| Packertown | 1 | 1973 | 1967 |
| Ellis | 1 | 1988 | 1966 |
| Kankakee Sands | 1 | 2023 | 2023 |
| W Lafayette | 1 | 1994 | 1991 |
| Tipton | 1 | 1983 | 1974 |
| Lagrange | 1 | 2011 | 2002 |
Pied-billed Grebe Population Trend in Other States
alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.