BirdAnalyst
Species · BCR 28 · BBS 2026 Release · 1966–2025

Ring-billed Gull In Appalachian Mountains

All regionsAppalachian MountainsWetland birds

Ring-billed Gull in Appalachian Mountains has surged: up 12× on the route-weighted index since 1972.

12×Since 1972TrendPercent 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 →
31Routes 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 →
48YearsYears 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 Ring-billed Gull in Appalachian Mountains. See the full index history below.

Ring-billed Gull In Appalachian Mountains Population Forecast

If the recent trend holds, Ring-billed Gull in Appalachian Mountains is projected to stay roughly flat through 2030, near 0.23 (95% range 0.00–0.48). A 5-year backtest shows a typical error of ±722.7%, with 60% of held-out values landing inside the 95% band.

n/aChange by 2030TrendPercent 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 →
0.23Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.4895% 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 →
±722.7%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, Ring-billed Gull in Appalachian Mountains is projected to stay roughly flat through 2030, near 0.23 (95% range 0.00–0.48). A 5-year backtest shows a typical error of ±722.7%, with 60% of held-out values landing inside the 95% band.19692030
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 →
20260.210.000.46
20270.220.000.47
20280.220.000.47
20290.230.000.47
20300.230.000.48

Routes In Appalachian Mountains

Routes recording Ring-billed Gull in Appalachian Mountains.
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 →
RosecransPENNSYLVANIA352002
New RinggoldPENNSYLVANIA312002
DrydenNEW-YORK172024
DownsvilleNEW-YORK71995
GainesvilleNEW-YORK52023
WilliamsportMARYLAND41984
WakenaPENNSYLVANIA41990
East JavaNEW-YORK32025
MeadowbrookOHIO32016
KittanningPENNSYLVANIA31997
Wild CreekPENNSYLVANIA31996
Pine GroveALABAMA21997
SteyerMARYLAND22000
AustinvillePENNSYLVANIA22007
VindexMARYLAND11983
MidvaleNEW-JERSEY11997
BloomsburyNEW-JERSEY12011
High PointNEW-JERSEY12003
SwainNEW-YORK11988
S VandaliaNEW-YORK11972
N WashingtonPENNSYLVANIA12005
Mawr GlenPENNSYLVANIA11995
MillvillePENNSYLVANIA11981
HonesdalePENNSYLVANIA11992
GreentownPENNSYLVANIA12019

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.