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Species · BCR 20 · BBS 2025 Release · 1966–2024

Chimney Swift In Edwards Plateau

All regionsEdwards PlateauAerial insectivores

Chimney Swift in Edwards Plateau has fallen sharply: down 74% on the route-weighted index since 1970.

-74%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 →
19Routes In RegionSurvey 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 SignalsNotable 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 →

Chimney Swift has fallen sharply in Edwards Plateau: down 74% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Chimney Swift in Edwards Plateau is projected to fall about 55% by 2029 — from 0.81 in 2024 to a central estimate of 0.36 (95% range 0.00–2.1). A 5-year backtest shows a typical error of ±67.5%, with 100% of held-out values landing inside the 95% band.

-55%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 →
0.36Projected 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 →
0.00–2.195% 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 →
±67.5%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, Chimney Swift in Edwards Plateau is projected to fall about 55% by 2029 — from 0.81 in 2024 to a central estimate of 0.36 (95% range 0.00–2.1). A 5-year backtest shows a typical error of ±67.5%, with 100% of held-out values landing inside the 95% band.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 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 →
20250.580.002.3
20260.520.002.3
20270.470.002.2
20280.420.002.2
20290.360.002.1

Routes In Edwards Plateau

Routes recording Chimney Swift in Edwards Plateau.
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 →
GeorgetownTEXAS91985
ManorTEXAS72024
Dripping SpgTEXAS32024
LeanderTEXAS32005
AdamsvilleTEXAS22024
LeakeyTEXAS22023
MontellTEXAS22011
BoerneTEXAS12016
UtopiaTEXAS12023
FitzhughTEXAS11983
Valley SpgsTEXAS12024
HarperTEXAS12023
San SabaTEXAS12017
PidcokeTEXAS12016
KempnerTEXAS12022
Indian MtnTEXAS12018
Pidcoke 2TEXAS12018
Prairie Mtn.TEXAS12023
Allen CreekTEXAS12018

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