Species · Maryland · BBS 2025 Release · 1966–2024
Louisiana Waterthrush Population Trend in Maryland
Louisiana Waterthrush in Maryland has surged: up 249% on the route-weighted index since 1968.
+249%Since 1968
64Routes In State
58Years
Notable Louisiana Waterthrush Trends in Maryland
long arc increasecomputed index
Louisiana Waterthrush has surged in Maryland: up 249% on the route-weighted index since 1968.
Louisiana Waterthrush Population Forecast in Maryland
If the recent trend holds, Louisiana Waterthrush in Maryland is projected to stay roughly flat through 2029, near 0.87 (95% range 0.57–1.2). A 5-year backtest shows a typical error of ±19.2%, with 60% of held-out values landing inside the 95% band.
-6%Change by 2029
0.87Projected 2029 index
0.57–1.295% range
±19.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.83 | 0.53 | 1.1 |
| 2026 | 0.84 | 0.54 | 1.1 |
| 2027 | 0.85 | 0.55 | 1.2 |
| 2028 | 0.86 | 0.56 | 1.2 |
| 2029 | 0.87 | 0.57 | 1.2 |
Louisiana Waterthrush Survey Routes in Maryland
| Wolfsville | 5 | 2024 | 1966 |
| Piney Grove | 5 | 2024 | 1997 |
| Earlton | 4 | 2024 | 2014 |
| Accident 2 | 4 | 2023 | 2018 |
| Floyd | 3 | 2024 | 1966 |
| Tall Timbers | 3 | 2013 | 1966 |
| Jennings | 3 | 2024 | 1995 |
| Green Ridge | 3 | 2024 | 1996 |
| Ijamsville | 3 | 2024 | 1989 |
| Davidsnville | 3 | 2024 | 1984 |
| Smithsburg | 2 | 2014 | 1972 |
| Silver Spg | 2 | 1988 | 1973 |
| Matthews | 2 | 2021 | 1974 |
| Vienna | 2 | 2010 | 1967 |
| Sinepuxent | 2 | 1971 | 1971 |
| Accident | 2 | 2014 | 1993 |
| Wheaton | 2 | 2024 | 1991 |
| Island Creek | 2 | 2024 | 1992 |
| Mt Nebo | 1 | 1981 | 1972 |
| Vindex | 1 | 2014 | 1967 |
| Oldtown | 1 | 2023 | 1970 |
| Potomac Park | 1 | 2023 | 1970 |
| Williamsport | 1 | 2017 | 1989 |
| Bald Friar | 1 | 1994 | 1994 |
| Olney | 1 | 2023 | 1966 |
Louisiana Waterthrush Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.