BirdAnalyst
Species · BCR 29 · BBS 2025 Release · 1966–2024

Wood Thrush In Piedmont

All regionsPiedmontForest birds

Wood Thrush in Piedmont has fallen sharply: down 54% on the route-weighted index since 1968.

-54%Since 1968TrendPercent 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 →
169Routes 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 →
58YearsYears 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 →

Wood Thrush has fallen sharply in Piedmont: down 54% on the route-weighted index since 1968.

Wood Thrush In Piedmont Population Forecast

If the recent trend holds, Wood Thrush in Piedmont is projected to fall about 36% by 2029 — from 8.2 in 2024 to a central estimate of 5.2 (95% range 2.3–8.1). A 5-year backtest shows a typical error of ±18.5%, with 100% of held-out values landing inside the 95% band.

-36%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 →
5.2Projected 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 →
2.3–8.195% 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 →
±18.5%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, Wood Thrush in Piedmont is projected to fall about 36% by 2029 — from 8.2 in 2024 to a central estimate of 5.2 (95% range 2.3–8.1). A 5-year backtest shows a typical error of ±18.5%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20255.93.08.8
20265.72.88.6
20275.62.68.5
20285.42.58.3
20295.22.38.1

Routes In Piedmont

Routes recording Wood Thrush in Piedmont.
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 →
EarltonMARYLAND292024
Pw Forest PkVIRGINIA292009
EkloMARYLAND272018
Bald FriarMARYLAND271996
Yates CrossroadsGEORGIA252024
NixburgALABAMA241999
AppomattoxVIRGINIA242024
Liberty City 2ALABAMA232024
MillervilleALABAMA212024
LanettALABAMA202024
OlneyMARYLAND202024
PartlowVIRGINIA202015
Ft Pickett SVIRGINIA201995
CallNORTH-CAROLINA192024
WedoweeALABAMA182023
CrotonNEW-JERSEY182007
CherryvilleNORTH-CAROLINA181968
Nixburg 2ALABAMA172024
Van BibberMARYLAND172013
MooresvilleNORTH-CAROLINA172001
WhitmireSOUTH-CAROLINA172024
ElamsvilleVIRGINIA172016
RutledgeGEORGIA162024
Lincolnton 2GEORGIA162024
EmmitsburgMARYLAND162024

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