Species · North Carolina · BBS 2025 Release · 1966–2024
Bank Swallow Population Trend in North Carolina
Bank Swallow in North Carolina has collapsed: down 88% on the route-weighted index since 1977.
-88%Since 1977
7Routes In State
20Years
Notable Bank Swallow Trends in North Carolina
long arc declinecomputed index
Bank Swallow has collapsed in North Carolina: down 88% on the route-weighted index since 1977.
Bank Swallow Population Forecast in North Carolina
If the recent trend holds, Bank Swallow in North Carolina is projected to stay roughly flat through 2021, near 0.00 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±261%, with 80% of held-out values landing inside the 95% band.
n/aChange by 2021
0.00Projected 2021 index
0.00–0.2295% range
±261%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2017 | 0.01 | 0.00 | 0.24 |
| 2018 | 0.01 | 0.00 | 0.23 |
| 2019 | 0.01 | 0.00 | 0.23 |
| 2020 | 0.00 | 0.00 | 0.22 |
| 2021 | 0.00 | 0.00 | 0.22 |
Bank Swallow Survey Routes in North Carolina
Bank Swallow Population Trend in Other States
alabamaalaskaarkansascaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.