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

Willet Population Trend in Wyoming

All statesShorebirds

Willet in Wyoming has surged: up 160% on the route-weighted index since 1979.

+160%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 →
46YearsYears 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 →

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 →

Willet has surged in Wyoming: up 160% on the route-weighted index since 1979.

Willet Population Forecast in Wyoming

If the recent trend holds, Willet in Wyoming is projected to rise about 13% by 2029 — from 0.37 in 2024 to a central estimate of 0.42 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±41.1%, with 100% of held-out values landing inside the 95% band.

+13%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 →
0.42Projected 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 →
0.00–1.195% 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 →
±41.1%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 13% by 2029 — from 0.37 in 2024 to a central estimate of 0.42 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±41.1%, with 100% of held-out values landing inside the 95% band.19772029
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 →
20250.420.001.1
20260.420.001.1
20270.420.001.1
20280.420.001.1
20290.420.001.1

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
Ryegrass2220241990
Meeteetse1420192019
Rock River1120221991
Daniel1019881980
Harmony520232006
Upton420121999
Soda Lake420241980
Cumberland320241977
Recluse319951995
Seedskadee320141994
Boulder320181982
Bucknum320192019
Yellowstone219981998
Crowheart219871987
Gebo219971997
Newcastle220131998
Pathfinder219911991
Walcott220242003
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 2026-05-22.