Species · Indiana · BBS 2025 Release · 1966–2024
Northern Harrier Population Trend in Indiana
Northern Harrier in Indiana has fallen sharply: down 65% on the route-weighted index since 1971.
-65%Since 1971
23Routes In State
30Years
Notable Northern Harrier Trends in Indiana
long arc declinecomputed index
Northern Harrier has fallen sharply in Indiana: down 65% on the route-weighted index since 1971.
Northern Harrier Population Forecast in Indiana
If the recent trend holds, Northern Harrier in Indiana is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±52.4%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.03Projected 2029 index
0.00–0.1095% range
±52.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.03 | 0.00 | 0.10 |
| 2026 | 0.03 | 0.00 | 0.10 |
| 2027 | 0.03 | 0.00 | 0.10 |
| 2028 | 0.03 | 0.00 | 0.10 |
| 2029 | 0.03 | 0.00 | 0.10 |
Northern Harrier Survey Routes in Indiana
| Hebron | 1 | 2014 | 2014 |
| Kankakee Sands | 1 | 2023 | 2004 |
| Ellis | 1 | 2015 | 1970 |
| Fowler | 1 | 2004 | 1966 |
| W Lafayette | 1 | 2011 | 1985 |
| Galveston | 1 | 1991 | 1991 |
| Middletown | 1 | 1988 | 1988 |
| Swayzee | 1 | 2019 | 2019 |
| Berne | 1 | 1987 | 1983 |
| Pimento | 1 | 1998 | 1998 |
| Brazil | 1 | 2015 | 2000 |
| Jamestown | 1 | 2019 | 2019 |
| Sexton | 1 | 2024 | 1991 |
| Milroy | 1 | 2004 | 2000 |
| Shelbyville | 1 | 2010 | 2010 |
| Washington | 1 | 1987 | 1987 |
| Millersburg | 1 | 2005 | 2003 |
| Indian Spgs | 1 | 1997 | 1997 |
| Evansville | 1 | 2002 | 2002 |
| Crown Point | 1 | 2000 | 1999 |
| Newberry | 1 | 2019 | 2005 |
| Cyprss | 1 | 2005 | 2005 |
| Kokomo | 1 | 2015 | 2015 |
Northern Harrier Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.