Species · Illinois · BBS 2025 Release · 1966–2024
Louisiana Waterthrush Population Trend in Illinois
Louisiana Waterthrush in Illinois has surged: up 239% on the route-weighted index since 1984.
+239%Since 1984
25Routes In State
38Years
Notable Louisiana Waterthrush Trends in Illinois
long arc increasecomputed index
Louisiana Waterthrush has surged in Illinois: up 239% on the route-weighted index since 1984.
Louisiana Waterthrush Population Forecast in Illinois
If the recent trend holds, Louisiana Waterthrush in Illinois is projected to fall about 28% by 2029 — from 0.12 in 2024 to a central estimate of 0.09 (95% range 0.03–0.14). A 5-year backtest shows a typical error of ±122.8%, with 80% of held-out values landing inside the 95% band.
-28%Change by 2029
0.09Projected 2029 index
0.03–0.1495% range
±122.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.08 | 0.02 | 0.14 |
| 2026 | 0.08 | 0.02 | 0.14 |
| 2027 | 0.08 | 0.02 | 0.14 |
| 2028 | 0.08 | 0.03 | 0.14 |
| 2029 | 0.09 | 0.03 | 0.14 |
Louisiana Waterthrush Survey Routes in Illinois
| Belleview | 4 | 2024 | 1995 |
| Payson | 2 | 2018 | 2000 |
| Columbia | 2 | 2017 | 2001 |
| Delwood | 2 | 2024 | 1984 |
| Cave In Rock | 2 | 2023 | 1997 |
| Bartonville | 1 | 2022 | 2022 |
| Melrose | 1 | 1998 | 1990 |
| Athensville | 1 | 1984 | 1984 |
| Concord | 1 | 2014 | 2011 |
| Clarksdale | 1 | 1971 | 1971 |
| Mascoutah Lk | 1 | 2005 | 2005 |
| Clayton | 1 | 2016 | 2016 |
| Brnt Prairie | 1 | 2018 | 2018 |
| Grape Creek | 1 | 2013 | 2008 |
| Eubanks | 1 | 2022 | 2003 |
| Pulaski | 1 | 2024 | 2018 |
| Bremen | 1 | 2024 | 1989 |
| Belknap | 1 | 2024 | 2005 |
| Beaverdam Lk | 1 | 2016 | 1972 |
| Marshall | 1 | 2015 | 2015 |
| Dudleyville | 1 | 2018 | 2018 |
| Kell | 1 | 2013 | 2002 |
| Camp Point | 1 | 2006 | 2001 |
| Eldred | 1 | 2009 | 2009 |
| Sandusky | 1 | 2023 | 1993 |
Louisiana Waterthrush Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.