BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Willet Population Trend in Wyoming

All statesShorebirds

Willet in Wyoming has increased: up 43% on the route-weighted index since 1979.

+43%Since 1979TrendPercent 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 →
38Routes 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 →
47YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Willet 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 →

No notable trend signals for Willet in Wyoming. See the full index history below.

Willet Population Forecast in Wyoming

If the recent trend holds, Willet in Wyoming is projected to rise about 45% by 2030 — from 0.28 in 2025 to a central estimate of 0.40 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±42.9%, with 100% of held-out values landing inside the 95% band.

+45%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 →
0.40Projected 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 →
0.00–1.195% 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 →
±42.9%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, Willet in Wyoming is projected to rise about 45% by 2030 — from 0.28 in 2025 to a central estimate of 0.40 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±42.9%, with 100% of held-out values landing inside the 95% band.19772030
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 →
20260.410.001.1
20270.410.001.1
20280.410.001.1
20290.400.001.1
20300.400.001.1

Willet Survey Routes in Wyoming

Routes recording Willet 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 →
Fiddler Lk5720061987
Ryegrass1920251990
Meeteetse1420192019
Rock River1120221991
Daniel1019881980
Upton420121999
Soda Lake420241980
Recluse319951995
Seedskadee320141994
Boulder320251982
Bucknum320192019
Yellowstone219981998
Cumberland220251977
Crowheart219871987
Gebo219971997
Newcastle220131998
Pathfinder219911991
Walcott220242003
Harmony220252006
Elk Horn 2220222022
Wyarno120232023
Nowood119881988
Natrona119881988
Fontenelle120241982
Elk Horn119921992

Willet Population Trend in Other States

alabamacaliforniacoloradoconnecticutdelawarefloridaidaholouisianamainemarylandmassachusettsminnesotamontananebraskanevadanew-jerseynew-yorknorth-carolinanorth-dakotaoregonsouth-carolinasouth-dakotatexasutahvirginia

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