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

Bachman's Sparrow In Piedmont

All regionsPiedmontGeneralists

Bachman's Sparrow in Piedmont has declined: down 43% on the route-weighted index since 1968.

-43%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 →
22Routes 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 →
38YearsYears 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 →

No notable trend signals for Bachman's Sparrow in Piedmont. See the full index history below.

Bachman's Sparrow In Piedmont Population Forecast

If the recent trend holds, Bachman's Sparrow in Piedmont is projected to stay roughly flat through 2014, near 0.09 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±530.7%, with 60% of held-out values landing inside the 95% band.

n/aChange by 2014TrendPercent 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 →
0.09Projected 2014 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2195% 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 →
±530.7%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, Bachman's Sparrow in Piedmont is projected to stay roughly flat through 2014, near 0.09 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±530.7%, with 60% of held-out values landing inside the 95% band.19662014
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 →
20100.090.000.21
20110.090.000.21
20120.090.000.21
20130.090.000.21
20140.090.000.21

Routes In Piedmont

Routes recording Bachman's Sparrow 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 →
Piedmont NwrGEORGIA52003
GrovetownGEORGIA41988
ForsythGEORGIA31994
RutledgeGEORGIA31981
LanettALABAMA22003
CherryvilleNORTH-CAROLINA21968
PendletonSOUTH-CAROLINA21970
Plum BranchSOUTH-CAROLINA21992
BrodnaxVIRGINIA21989
Nixburg 2ALABAMA12009
CrestGEORGIA11987
LincolntonGEORGIA11987
HollonvilleGEORGIA11976
SiloamGEORGIA11992
StockbridgeGEORGIA11984
WashingtonGEORGIA11986
MetasvilleGEORGIA11998
ArcolaNORTH-CAROLINA11985
Little MtnSOUTH-CAROLINA11985
Salem XrdSOUTH-CAROLINA12005
Cauthens XrdSOUTH-CAROLINA11985
MannboroVIRGINIA11999

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