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

Common Nighthawk In Piedmont

All regionsPiedmontAerial insectivores

Common Nighthawk in Piedmont has collapsed: down 97% on the route-weighted index since 1968.

-97%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 →
44Routes 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 →
31YearsYears 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 →

Common Nighthawk has collapsed in Piedmont: down 97% on the route-weighted index since 1968.

Common Nighthawk In Piedmont Population Forecast

If the recent trend holds, Common Nighthawk in Piedmont is projected to stay roughly flat through 2021, near 0.00 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±988.3%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2021TrendPercent 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 →
0.00Projected 2021 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2595% 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 →
±988.3%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, Common Nighthawk in Piedmont is projected to stay roughly flat through 2021, near 0.00 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±988.3%, with 100% of held-out values landing inside the 95% band.19662021
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 →
20170.000.000.25
20180.000.000.25
20190.000.000.25
20200.000.000.25
20210.000.000.25

Routes In Piedmont

Routes recording Common Nighthawk 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 →
PendletonSOUTH-CAROLINA321968
WylliesburgVIRGINIA61977
PassaicNEW-JERSEY21969
AspersPENNSYLVANIA21981
LabottPENNSYLVANIA21976
RinggoldVIRGINIA21991
MillervilleALABAMA11971
LanettALABAMA11987
Liberty CityALABAMA11995
ForsythGEORGIA11980
MaxeysGEORGIA11968
HollonvilleGEORGIA11977
AthensGEORGIA11978
BaldwinGEORGIA11970
GrovetownGEORGIA12006
HiramGEORGIA11982
RutledgeGEORGIA11975
Silver SpgMARYLAND11970
RandallstownMARYLAND11972
ClimaxNORTH-CAROLINA11986
MooresvilleNORTH-CAROLINA11986
CherryvilleNORTH-CAROLINA11966
YoungsvilleNORTH-CAROLINA11969
MadisonNORTH-CAROLINA11976
CopelandNORTH-CAROLINA12016

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