BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Ring-billed Gull In Great Basin

All regionsGreat BasinWetland birds

Ring-billed Gull in Great Basin has held roughly steady: up 8% on the route-weighted index since 1971.

+8%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 →
113Routes 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 →
56YearsYears 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 Great Basin. See the full index history below.

Ring-billed Gull In Great Basin Population Forecast

If the recent trend holds, Ring-billed Gull in Great Basin is projected to fall about 12% by 2030 — from 8.0 in 2025 to a central estimate of 7.1 (95% range 0.00–18). A 5-year backtest shows a typical error of ±158.5%, with 100% of held-out values landing inside the 95% band.

-12%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 →
7.1Projected 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 →
0.00–1895% 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 →
±158.5%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 Great Basin is projected to fall about 12% by 2030 — from 8.0 in 2025 to a central estimate of 7.1 (95% range 0.00–18). A 5-year backtest shows a typical error of ±158.5%, 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 →
20267.60.0019
20277.50.0018
20287.30.0018
20297.20.0018
20307.10.0018

Routes In Great Basin

Routes recording Ring-billed Gull in Great Basin.
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 →
LikelyCALIFORNIA3622025
Modoc Point 2OREGON3052025
DorrisCALIFORNIA2762019
Blacks CreekIDAHO2732017
Hanford SiteWASHINGTON2111996
Mud LakeIDAHO2022025
OthelloWASHINGTON1481991
MoraIDAHO1132025
UmatillaOREGON922023
MesaWASHINGTON822008
CraneOREGON471998
LakeviewOREGON462010
PrincetonOREGON431985
GardnervilleNEVADA402004
HenryIDAHO371981
MacdoelCALIFORNIA352019
MontagueOREGON331989
IngallsCALIFORNIA292025
Dobbin CreekNEVADA292014
NubieberCALIFORNIA262007
Bear RiverUTAH262025
PocatelloIDAHO242013
SheavilleOREGON232021
CallaoUTAH232016
PotholesWASHINGTON222023

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