BirdAnalyst
Species · BCR 17 · BBS 2026 Release · 1966–2025

Willet In Badlands and Prairies

All regionsBadlands and PrairiesShorebirds

Willet in Badlands and Prairies has risen sharply: up 64% on the route-weighted index since 1971.

+64%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 →
43Routes 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 →

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 risen sharply in Badlands and Prairies: up 64% on the route-weighted index since 1971.

Willet In Badlands and Prairies Population Forecast

If the recent trend holds, Willet in Badlands and Prairies is projected to rise about 199% by 2030 — from 0.09 in 2025 to a central estimate of 0.26 (95% range 0.04–0.47). A 5-year backtest shows a typical error of ±83%, with 100% of held-out values landing inside the 95% band.

+199%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 →
0.26Projected 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 →
0.04–0.4795% 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 →
±83%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 Badlands and Prairies is projected to rise about 199% by 2030 — from 0.09 in 2025 to a central estimate of 0.26 (95% range 0.04–0.47). A 5-year backtest shows a typical error of ±83%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20260.250.030.46
20270.250.040.47
20280.250.040.47
20290.260.040.47
20300.260.040.47

Routes In Badlands and Prairies

Routes recording Willet in Badlands and Prairies.
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 →
HighwoodMONTANA92017
OttumwaSOUTH-DAKOTA42009
UptonWYOMING42012
RecluseWYOMING31995
BucknumWYOMING32019
RoyMONTANA22023
IngomarMONTANA22025
Flatwillow 2MONTANA22018
RoundupMONTANA22025
Wheat BasinMONTANA22023
ZapNORTH-DAKOTA21992
Cedar CreekNORTH-DAKOTA22012
BentleyNORTH-DAKOTA22024
Glen UllinNORTH-DAKOTA22021
ArdmoreSOUTH-DAKOTA21978
CottonwoodSOUTH-DAKOTA22025
NewcastleWYOMING22013
LeroyMONTANA12019
JordanMONTANA12002
Two DotMONTANA12024
ShawmutMONTANA12023
FlatwillowMONTANA11997
LocateMONTANA12008
AlbionMONTANA11994
WinnettMONTANA12022

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