Species · Delaware · BBS 2025 Release · 1966–2024
Bank Swallow Population Trend in Delaware
Bank Swallow in Delaware has held roughly steady: up 10% on the route-weighted index since 1969.
+10%Since 1969
8Routes In State
39Years
Notable Bank Swallow Trends in Delaware
No notable trend signals for Bank Swallow in Delaware. See the full index history below.
Bank Swallow Population Forecast in Delaware
If the recent trend holds, Bank Swallow in Delaware is projected to rise about 688% by 2029 — from 0.20 in 2024 to a central estimate of 1.6 (95% range 0.00–5.3). A 5-year backtest shows a typical error of ±350.3%, with 100% of held-out values landing inside the 95% band.
+688%Change by 2029
1.6Projected 2029 index
0.00–5.395% range
±350.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 1.6 | 0.00 | 5.3 |
| 2026 | 1.6 | 0.00 | 5.3 |
| 2027 | 1.6 | 0.00 | 5.3 |
| 2028 | 1.6 | 0.00 | 5.3 |
| 2029 | 1.6 | 0.00 | 5.3 |
Bank Swallow Survey Routes in Delaware
| Mt Pleasant | 12 | 2015 | 1984 |
| Holleyville | 6 | 2003 | 1995 |
| Milton | 4 | 1969 | 1969 |
| Blackbird | 2 | 2003 | 2003 |
| Wilmington | 1 | 1968 | 1966 |
| Harrington | 1 | 2024 | 1968 |
| Frederica | 1 | 1975 | 1975 |
| Lowes Xrds | 1 | 1975 | 1972 |
Bank Swallow Population Trend in Other States
alabamaalaskaarkansascaliforniacoloradoconnecticutidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.