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

Willet Population Trend in Nevada

All statesShorebirds

Willet in Nevada has surged: up 216% on the route-weighted index since 1991.

+216%Since 1991TrendPercent 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 →
13Routes 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 →
34YearsYears 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 NevadaNotable 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 Nevada: up 216% on the route-weighted index since 1991.

Willet Population Forecast in Nevada

If the recent trend holds, Willet in Nevada is projected to rise about 20% by 2029 — from 0.46 in 2024 to a central estimate of 0.56 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±56%, with 100% of held-out values landing inside the 95% band.

+20%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 →
0.56Projected 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 →
±56%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 Nevada is projected to rise about 20% by 2029 — from 0.46 in 2024 to a central estimate of 0.56 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±56%, with 100% 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 →
20250.550.001.1
20260.550.001.1
20270.550.001.1
20280.550.001.1
20290.560.001.1

Willet Survey Routes in Nevada

Routes recording Willet in Nevada.
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 →
Ruby Valley1320011997
Midas720241990
Gardnerville720051992
Chimney Res.420242005
Fallon320051992
Piute Mdws220132013
Cortez220242017
Dinner Sta119681968
Bald Mtn.119971992
Sand Pass119971994
Walker Can119991993
Ruby Valley 2120192004
Majors Place119961991

Willet Population Trend in Other States

alabamacaliforniacoloradoconnecticutdelawarefloridaidaholouisianamainemarylandmassachusettsminnesotamontananebraskanew-jerseynew-yorknorth-carolinanorth-dakotaoregonsouth-carolinasouth-dakotatexasutahvirginiawyoming

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