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Species · Wyoming · BBS 2026 Release · 1966–2025

Bank Swallow Population Trend in Wyoming

All statesAerial insectivores

Bank Swallow in Wyoming has edged down: down 15% on the route-weighted index since 1971.

-15%Since 1971TrendPercent 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 →
87Routes 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 →
55YearsYears 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 WyomingNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Bank Swallow in Wyoming. See the full index history below.

Bank Swallow Population Forecast in Wyoming

If the recent trend holds, Bank Swallow in Wyoming is projected to rise about 136% by 2030 — from 0.95 in 2025 to a central estimate of 2.2 (95% range 0.00–5.4). A 5-year backtest shows a typical error of ±119.9%, with 100% of held-out values landing inside the 95% band.

+136%Change by 2030TrendPercent 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 →
2.2Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–5.495% 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 →
±119.9%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 Wyoming is projected to rise about 136% by 2030 — from 0.95 in 2025 to a central estimate of 2.2 (95% range 0.00–5.4). A 5-year backtest shows a typical error of ±119.9%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20262.20.005.3
20272.20.005.3
20282.20.005.4
20292.20.005.4
20302.20.005.4

Bank Swallow Survey Routes in Wyoming

Routes recording Bank Swallow in Wyoming.
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 →
Mtn View4120241987
Yellowstone3520251987
Pathfinder2520241989
Ryegrass2520171990
Seedskadee2320232001
Walcott2120181985
Ethete1720251991
Mayoworth1320241982
Natrona1219921992
Diamondville1219791979
Seely1019951995
Kaycee1020252025
Harmony1019891989
Gvnt Valley1020172007
Hayden Val1019861985
Lovell820161991
Wilson819831979
Arminto820221994
Lamont820151987
Sundance720092008
Patrick Draw 5720092004
Riverview619971983
Big Sandy620251994
Moran620162016
Patrick Draw519801978

Bank Swallow Population Trend in Other States

alabamaalaskaarkansascaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.