BirdAnalyst
Species · Illinois · BBS 2025 Release · 1966–2024

Bank Swallow Population Trend in Illinois

All statesAerial insectivores

Bank Swallow in Illinois has collapsed: down 95% on the route-weighted index since 1968.

-95%Since 1968
60Routes In State
58Years

Notable Bank Swallow Trends in Illinois

long arc declinecomputed index

Bank Swallow has collapsed in Illinois: down 95% on the route-weighted index since 1968.

Bank Swallow Population Forecast in Illinois

If the recent trend holds, Bank Swallow in Illinois is projected to rise about 237% by 2029 — from 0.39 in 2024 to a central estimate of 1.3 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±2513.9%, with 100% of held-out values landing inside the 95% band.

+237%Change by 2029
1.3Projected 2029 index
0.00–3.595% range
±2513.9%Backtest error
19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20251.30.003.5
20261.30.003.5
20271.30.003.5
20281.30.003.5
20291.30.003.5

Bank Swallow Survey Routes in Illinois

Routes recording Bank Swallow in Illinois.
Wayne2620241979
Mackinaw1320171966
Grape Creek1120192019
Mt Vernon1019801980
Sterling820072001
Jamestown719811968
Keithsburg720092009
Concord619871987
Newark420161970
Milford420131980
Eldred420211993
Geneseo320211967
Compton319891989
Williamsfld319741973
Melrose319981978
Union320112011
Troy Grove320052005
Guilford220141967
Sheffield220221966
Essex220061971
Chandlervill220021971
Terre Haute220171972
Monica220001975
Bluff Spgs220091970
Mascoutah Lk219991967

Bank Swallow Population Trend in Other States

alabamaalaskaarkansascaliforniacoloradoconnecticutdelawareidahoindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.