Species · Maine · BBS 2025 Release · 1966–2024
Swamp Sparrow Population Trend in Maine
Swamp Sparrow in Maine has increased: up 48% on the route-weighted index since 1968.
+48%Since 1968
67Routes In State
58Years
Notable Swamp Sparrow Trends in Maine
No notable trend signals for Swamp Sparrow in Maine. See the full index history below.
Swamp Sparrow Population Forecast in Maine
If the recent trend holds, Swamp Sparrow in Maine is projected to fall about 26% by 2029 — from 1.2 in 2024 to a central estimate of 0.89 (95% range 0.42–1.4). A 5-year backtest shows a typical error of ±24.7%, with 80% of held-out values landing inside the 95% band.
-26%Change by 2029
0.89Projected 2029 index
0.42–1.495% range
±24.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.89 | 0.42 | 1.4 |
| 2026 | 0.89 | 0.42 | 1.4 |
| 2027 | 0.89 | 0.42 | 1.4 |
| 2028 | 0.89 | 0.42 | 1.4 |
| 2029 | 0.89 | 0.42 | 1.4 |
Swamp Sparrow Survey Routes in Maine
| Northfield | 8 | 1981 | 1976 |
| Carrying Pl | 7 | 2024 | 1980 |
| Forest Sta | 6 | 2000 | 1970 |
| Waite | 5 | 1977 | 1977 |
| Turner | 4 | 2002 | 1972 |
| Greenwood | 4 | 2024 | 1974 |
| Benton | 4 | 1971 | 1971 |
| Grnd Lk Strm | 4 | 2000 | 1966 |
| Cape Neddick | 3 | 1973 | 1972 |
| Bethel | 3 | 2019 | 1977 |
| Reeds | 3 | 2024 | 1992 |
| Hermon | 3 | 2017 | 1966 |
| Charleston | 3 | 2019 | 1977 |
| Medway | 3 | 2018 | 1976 |
| Pillsbury Pd | 3 | 1968 | 1968 |
| Washburn | 3 | 2005 | 1995 |
| Northfield 2 | 3 | 2022 | 1992 |
| Jefferson | 3 | 2010 | 1991 |
| Westbrook | 2 | 2024 | 1977 |
| Wilson Mills | 2 | 2023 | 1983 |
| East Troy | 2 | 2018 | 1972 |
| Andover | 2 | 2021 | 2010 |
| Moose River | 2 | 2008 | 1983 |
| Carrabassett | 2 | 2024 | 1983 |
| Clayton Lake | 2 | 2000 | 1977 |
Swamp Sparrow Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.