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

Common Raven In Piedmont

All regionsPiedmontGeneralists

Common Raven in Piedmont has surged: up 635% on the route-weighted index since 1981.

+635%Since 1981TrendPercent 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 →
43Routes 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 →
37YearsYears 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 increasecomputed 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 Raven has surged in Piedmont: up 635% on the route-weighted index since 1981.

Forecast

If the recent trend holds, Common Raven in Piedmont is projected to fall about 46% by 2029 — from 0.36 in 2024 to a central estimate of 0.19 (95% range 0.06–0.33). A 5-year backtest shows a typical error of ±58.2%, with 40% of held-out values landing inside the 95% band.

-46%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 →
0.19Projected 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 →
0.06–0.3395% 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 →
±58.2%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 Raven in Piedmont is projected to fall about 46% by 2029 — from 0.36 in 2024 to a central estimate of 0.19 (95% range 0.06–0.33). A 5-year backtest shows a typical error of ±58.2%, with 40% of held-out values landing inside the 95% band.19782029
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 →
20250.180.040.32
20260.180.040.32
20270.190.050.33
20280.190.050.33
20290.190.060.33

Routes In Piedmont

Routes recording Common Raven 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 →
TaylorstownVIRGINIA92010
MoranVIRGINIA62024
EmmitsburgMARYLAND52024
IjamsvilleMARYLAND42023
PottersvilleNEW-JERSEY42014
OlneyMARYLAND32024
Pleasant ValMARYLAND32019
LeolaPENNSYLVANIA32023
ConcordVIRGINIA32021
WylliesburgVIRGINIA32014
MadonnaMARYLAND22022
YoungsvilleNORTH-CAROLINA22022
CopelandNORTH-CAROLINA22024
OsmondNORTH-CAROLINA22024
BendersvillePENNSYLVANIA22017
AmherstVIRGINIA22024
ShipmanVIRGINIA22024
ElamsvilleVIRGINIA22016
AppomattoxVIRGINIA22024
EkloMARYLAND11978
SandbrookNEW-JERSEY12024
GilletteNEW-JERSEY12022
ArcolaNORTH-CAROLINA12011
CallNORTH-CAROLINA12021
SawmillNORTH-CAROLINA12021

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