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

Bank Swallow Population Trend in Idaho

All statesAerial insectivores

Bank Swallow in Idaho has fallen sharply: down 63% on the route-weighted index since 1970.

-63%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
39Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bank Swallow Trends in IdahoNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Bank Swallow has fallen sharply in Idaho: down 63% on the route-weighted index since 1970.

Bank Swallow Population Forecast in Idaho

If the recent trend holds, Bank Swallow in Idaho is projected to rise about 58% by 2029 — from 2.7 in 2024 to a central estimate of 4.3 (95% range 0.00–17). A 5-year backtest shows a typical error of ±167.7%, with 100% of held-out values landing inside the 95% band.

+58%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
4.3Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–1795% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±167.7%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Bank Swallow in Idaho is projected to rise about 58% by 2029 — from 2.7 in 2024 to a central estimate of 4.3 (95% range 0.00–17). A 5-year backtest shows a typical error of ±167.7%, with 100% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20254.70.0017
20264.60.0017
20274.50.0017
20284.40.0017
20294.30.0017

Bank Swallow Survey Routes in Idaho

Routes recording Bank Swallow in Idaho.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Glenns Ferry16219861985
Pocatello9120191980
Preston5420231988
Springfield3520181970
Pasadena Val3020161987
Leadore2520241991
Coolin1620241989
Cedar Hill1620241992
Daniels Res1520161992
Cascade1219831968
Naples1020231972
Blacks Creek819821968
Baker720231993
Triangle720212003
Mud Lake720231990
Ririe620171974
Dubois520241975
Tractor Flat420242009
Crane Creek420122004
Dougal Res319961996
Blackft Res220151984
Gifford220151971
Squirrel219991988
Centerville220152009
Craters219871987

Bank Swallow Population Trend in Other States

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

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