BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Willet In Great Basin

All regionsGreat BasinShorebirds

Willet in Great Basin has declined: down 26% on the route-weighted index since 1971.

-26%Since 1971TrendPercent 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 →
85Routes 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 →
56YearsYears 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 →

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

Willet In Great Basin Population Forecast

If the recent trend holds, Willet in Great Basin is projected to rise about 53% by 2030 — from 0.79 in 2025 to a central estimate of 1.2 (95% range 0.09–2.3). A 5-year backtest shows a typical error of ±73.4%, with 100% of held-out values landing inside the 95% band.

+53%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 →
1.2Projected 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 →
0.09–2.395% 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 →
±73.4%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 Great Basin is projected to rise about 53% by 2030 — from 0.79 in 2025 to a central estimate of 1.2 (95% range 0.09–2.3). A 5-year backtest shows a typical error of ±73.4%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20261.30.132.4
20271.20.122.4
20281.20.112.4
20291.20.102.3
20301.20.092.3

Routes In Great Basin

Routes recording Willet in Great Basin.
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 →
DorrisCALIFORNIA502019
Malheur NwrOREGON302022
SnowvilleUTAH172025
MacdoelCALIFORNIA152019
CedarvilleCALIFORNIA142025
Ruby ValleyNEVADA132001
MadelineCALIFORNIA112025
HenryIDAHO101981
Lapham Res.OREGON102022
SheavilleOREGON102025
IngallsCALIFORNIA81999
Clear Lk ResCALIFORNIA72018
GardnervilleNEVADA72005
Alvord LakeOREGON72025
DuboisIDAHO62025
PrincetonOREGON61984
BlyOREGON62001
Bly 2OREGON62025
Bear RiverUTAH62025
BentonCALIFORNIA52024
Davis CreekCALIFORNIA52025
Warner VallyOREGON52023
Timpie SpgUTAH52002
Mud LakeIDAHO42019
Harney LakeOREGON42004

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