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

Bank Swallow Population Trend in Iowa

All statesAerial insectivores

Bank Swallow in Iowa has collapsed: down 92% on the route-weighted index since 1969.

-92%Since 1969
34Routes In State
55Years

Notable Bank Swallow Trends in Iowa

long arc declinecomputed index

Bank Swallow has collapsed in Iowa: down 92% on the route-weighted index since 1969.

Bank Swallow Population Forecast in Iowa

If the recent trend holds, Bank Swallow in Iowa is projected to rise about 285% by 2029 — from 0.27 in 2024 to a central estimate of 1.1 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±817.5%, with 100% of held-out values landing inside the 95% band.

+285%Change by 2029
1.1Projected 2029 index
0.00–3.595% range
±817.5%Backtest error
19672029
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
20251.10.003.5
20261.10.003.5
20271.10.003.5
20281.10.003.5
20291.10.003.5

Bank Swallow Survey Routes in Iowa

Routes recording Bank Swallow in Iowa.
Dinsdale1520151969
Cedar Valley1019971968
Prairieburg820131968
Desmoines719741974
Clare720081967
Brooklyn619801967
Wales620181970
Scranton620101967
Pierson620181968
Rock Valley520161971
Maquoketa420241968
Washta420131967
Mt Hamill320171990
Panther320221967
Neola319871972
Alice319881967
Lafayette320122012
West Liberty220241971
Williamsburg220161986
Hudson219911971
Sioux City220081968
Festina220211968
Titonka219791979
Exline120101979
Melrose119951995

Bank Swallow Population Trend in Other States

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

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