BirdAnalyst
Species · BCR 11 · BBS 2026 Release · 1966–2025

Ring-billed Gull In Prairie Potholes

All regionsPrairie PotholesWetland birds

Ring-billed Gull in Prairie Potholes has surged: up 690% on the route-weighted index since 1969.

+690%Since 1969TrendPercent 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 →
91Routes 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 →
58YearsYears 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 Prairie Potholes: up 690% on the route-weighted index since 1969.

Ring-billed Gull In Prairie Potholes Population Forecast

If the recent trend holds, Ring-billed Gull in Prairie Potholes is projected to rise about 39% by 2030 — from 9.5 in 2025 to a central estimate of 13 (95% range 8.1–18). A 5-year backtest shows a typical error of ±13.8%, with 80% of held-out values landing inside the 95% band.

+39%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 →
13Projected 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 →
8.1–1895% 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 →
±13.8%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 Prairie Potholes is projected to rise about 39% by 2030 — from 9.5 in 2025 to a central estimate of 13 (95% range 8.1–18). A 5-year backtest shows a typical error of ±13.8%, with 80% of held-out values landing inside the 95% band.19672030
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 →
2026127.318
2027137.518
2028137.718
2029137.918
2030138.118

Routes In Prairie Potholes

Routes recording Ring-billed Gull in Prairie Potholes.
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 →
Douglas CrkNORTH-DAKOTA1662025
Wild RoseNORTH-DAKOTA1522025
AppletonMINNESOTA1032025
DanzigNORTH-DAKOTA592014
CarpioNORTH-DAKOTA412023
Lakota 2NORTH-DAKOTA392025
ChinookMONTANA372025
ChokioMINNESOTA312025
BrittonSOUTH-DAKOTA292023
Big StoneMINNESOTA242012
WebsterNORTH-DAKOTA232024
Powers LakeNORTH-DAKOTA212025
NilesNORTH-DAKOTA202025
Great FallsMONTANA192021
EdgeleyNORTH-DAKOTA192025
WhitlashMONTANA182024
Lake GeorgeNORTH-DAKOTA182022
BuchananNORTH-DAKOTA182025
ParshallNORTH-DAKOTA172013
WorthingtonMINNESOTA162016
CooperstownNORTH-DAKOTA162025
LakotaNORTH-DAKOTA132009
Danzig 2NORTH-DAKOTA112025
WimbledonNORTH-DAKOTA102025
Horsehead LkNORTH-DAKOTA102025

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