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

Bank Swallow Population Trend in Washington

All statesAerial insectivores

Bank Swallow in Washington has fallen sharply: down 69% on the route-weighted index since 1970.

-69%Since 1970
62Routes In State
56Years

Notable Bank Swallow Trends in Washington

long arc declinecomputed index

Bank Swallow has fallen sharply in Washington: down 69% on the route-weighted index since 1970.

Bank Swallow Population Forecast in Washington

If the recent trend holds, Bank Swallow in Washington is projected to stay roughly flat through 2029, near 4.4 (95% range 0.00–11). A 5-year backtest shows a typical error of ±116.8%, with 100% of held-out values landing inside the 95% band.

-7%Change by 2029
4.4Projected 2029 index
0.00–1195% range
±116.8%Backtest error
19682029
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
20254.60.0011
20264.50.0011
20274.50.0011
20284.50.0011
20294.40.0011

Bank Swallow Survey Routes in Washington

Routes recording Bank Swallow in Washington.
Pomona10019991998
Scootney Reservoir8020242009
Hanford Site7419961988
Mesa7120081995
Nighthawk6020241992
Yakima5220241993
Wapato4120221971
Ewan 22020242023
Ellensburg1820241984
Othello1619911981
Mercer1520061972
Ewan1520192006
Harrington1320121989
Laurier1120122005
Concrete1020242013
Wilbur820241985
Horn Rapids820242005
Chewelah620081987
Selah620002000
Cusick620171990
Twisp520221969
Everett520242017
Keller420071968
Snowden419891971
Prescott420221988

Bank Swallow Population Trend in Other States

alabamaalaskaarkansascaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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