BirdAnalyst
Species · Wyoming · BBS 2025 Release · 1966–2024

Long-billed Curlew Population Trend in Wyoming

All statesShorebirds

Long-billed Curlew in Wyoming has surged: up 118% on the route-weighted index since 1981.

+118%Since 1981TrendPercent 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 →
39Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
44YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Long-billed Curlew Trends in WyomingNotable 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 →

Long-billed Curlew has surged in Wyoming: up 118% on the route-weighted index since 1981.

Long-billed Curlew Population Forecast in Wyoming

If the recent trend holds, Long-billed Curlew in Wyoming is projected to fall about 47% by 2029 — from 0.83 in 2024 to a central estimate of 0.44 (95% range 0.10–0.77). A 5-year backtest shows a typical error of ±44.5%, with 40% of held-out values landing inside the 95% band.

-47%Change by 2029TrendPercent 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 →
0.44Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.10–0.7795% 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 →
±44.5%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, Long-billed Curlew in Wyoming is projected to fall about 47% by 2029 — from 0.83 in 2024 to a central estimate of 0.44 (95% range 0.10–0.77). A 5-year backtest shows a typical error of ±44.5%, with 40% of held-out values landing inside the 95% band.19682029
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 →
20250.410.080.75
20260.420.090.76
20270.430.090.76
20280.430.100.77
20290.440.100.77

Long-billed Curlew Survey Routes in Wyoming

Routes recording Long-billed Curlew in Wyoming.
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 →
Big Sandy3420241988
Lusk1220241982
Newcastle1120241988
Fontenelle620241988
Riverview620222014
Mtn View519831980
Gvnt Valley320031997
Soda Well320242007
Kaycee320142014
Ne Entrance220192019
Natrona219681968
Seely 2220042004
Clark220241991
Recluse220041990
Ryegrass220222000
Seely219901990
Upton220242024
Sussex220062006
Meadowdale219901984
Green River219811981
Elk Horn 2220242024
Dubois120081990
Bill119931993
Cumberland120232023
Yoder119891989

Long-billed Curlew Population Trend in Other States

californiacoloradoidahokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashington

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