BirdAnalyst
Species · BCR 10 · BBS 2026 Release · 1966–2025

Ring-billed Gull In Northern Rockies

All regionsNorthern RockiesWetland birds

Ring-billed Gull in Northern Rockies has surged: up 907% on the route-weighted index since 1971.

+907%Since 1971TrendPercent 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 →
53Routes 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 →
55YearsYears 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 →

Ring-billed Gull has surged in Northern Rockies: up 907% on the route-weighted index since 1971.

Ring-billed Gull In Northern Rockies Population Forecast

If the recent trend holds, Ring-billed Gull in Northern Rockies is projected to stay roughly flat through 2030, near 2.9 (95% range 0.00–6.7). A 5-year backtest shows a typical error of ±127.6%, with 100% of held-out values landing inside the 95% band.

+1%Change 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 →
2.9Projected 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 →
0.00–6.795% 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 →
±127.6%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 Northern Rockies is projected to stay roughly flat through 2030, near 2.9 (95% range 0.00–6.7). A 5-year backtest shows a typical error of ±127.6%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20262.70.006.6
20272.80.006.6
20282.80.006.7
20292.80.006.7
20302.90.006.7

Routes In Northern Rockies

Routes recording Ring-billed Gull in Northern Rockies.
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 →
Neponset ResUTAH2502018
CodyWYOMING2012025
Pablo Res.MONTANA1512025
LimaMONTANA402025
CabartonIDAHO291986
MidvaleWYOMING292022
RawlinsWYOMING141999
RandolphUTAH132024
AlpineWYOMING122025
HarmonyWYOMING122022
Mtn ViewWYOMING101980
Saleratus CrUTAH92017
Green RiverWYOMING91982
Carter 2WYOMING92021
AugustaMONTANA82025
Willow Creek 2MONTANA82025
FontenelleWYOMING82024
BoulderMONTANA72022
CascadeIDAHO61976
BeaverheadMONTANA52019
CumberlandWYOMING51979
MckinnonWYOMING51983
EtheteWYOMING42025
LeoWYOMING42025
FeathervilleIDAHO32022

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