BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Willet In Northern Rockies

All regionsNorthern RockiesShorebirds

Willet in Northern Rockies has increased: up 32% on the route-weighted index since 1974.

+32%Since 1974TrendPercent 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 →
52Routes 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 →
51YearsYears 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 Northern Rockies. See the full index history below.

Willet In Northern Rockies Population Forecast

If the recent trend holds, Willet in Northern Rockies is projected to rise about 82% by 2029 — from 0.37 in 2024 to a central estimate of 0.67 (95% range 0.17–1.2). A 5-year backtest shows a typical error of ±84.1%, with 80% of held-out values landing inside the 95% band.

+82%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 →
0.67Projected 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 →
0.17–1.295% 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 →
±84.1%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 Northern Rockies is projected to rise about 82% by 2029 — from 0.37 in 2024 to a central estimate of 0.67 (95% range 0.17–1.2). A 5-year backtest shows a typical error of ±84.1%, with 80% of held-out values landing inside the 95% band.19692029
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 →
20250.660.161.2
20260.660.161.2
20270.670.171.2
20280.670.171.2
20290.670.171.2

Routes In Northern Rockies

Routes recording Willet in Northern Rockies.
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 LkWYOMING572006
RyegrassWYOMING222024
MeeteetseWYOMING142019
Rock RiverWYOMING112022
DanielWYOMING101988
BeaverheadMONTANA82024
Neponset ResUTAH82018
WickiupOREGON62011
RandolphUTAH62024
E. Bear LakeUTAH62022
HarmonyWYOMING52023
Saleratus CrUTAH42017
Soda LakeWYOMING42024
PolsonMONTANA31994
LimaMONTANA31999
CumberlandWYOMING32024
BoulderWYOMING32018
SeedskadeeWYOMING32014
Red RockMONTANA22008
St. Mary 2MONTANA22024
East Glacier ParkMONTANA22018
WoodruffUTAH22023
Crawford MtsUTAH22015
CrowheartWYOMING21987
GeboWYOMING21997

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