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

Northern Harrier In Piedmont

All regionsPiedmontGeneralists

Northern Harrier in Piedmont has fallen sharply: down 52% on the route-weighted index since 1985.

-52%Since 1985TrendPercent 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 →
11Routes 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 →
14YearsYears 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 Northern Harrier in Piedmont. See the full index history below.

Routes In Piedmont

Routes recording Northern Harrier 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 →
EmmitsburgMARYLAND22023
ShrewsburyPENNSYLVANIA21996
JulietteGEORGIA11981
NorwoodMARYLAND12002
MadonnaMARYLAND12018
CollegevillePENNSYLVANIA11997
Brick TavernPENNSYLVANIA12008
MannboroVIRGINIA11990
WylliesburgVIRGINIA11971
MoranVIRGINIA12007
Taylorstown 2VIRGINIA12017

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