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

Spotted Sandpiper Population Trend in Wisconsin

All statesShorebirds

Spotted Sandpiper in Wisconsin has fallen sharply: down 67% on the route-weighted index since 1968.

-67%Since 1968TrendPercent 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 →
72Routes 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 →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Spotted Sandpiper Trends in WisconsinNotable 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 declinecomputed 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 →

Spotted Sandpiper has fallen sharply in Wisconsin: down 67% on the route-weighted index since 1968.

Spotted Sandpiper Population Forecast in Wisconsin

If the recent trend holds, Spotted Sandpiper in Wisconsin is projected to fall about 82% by 2029 — from 0.18 in 2024 to a central estimate of 0.03 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±76%, with 100% 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 →
0.03Projected 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 →
0.00–0.2595% 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 →
±76%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, Spotted Sandpiper in Wisconsin is projected to fall about 82% by 2029 — from 0.18 in 2024 to a central estimate of 0.03 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±76%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20250.060.000.27
20260.050.000.27
20270.040.000.26
20280.040.000.26
20290.030.000.25

Spotted Sandpiper Survey Routes in Wisconsin

Routes recording Spotted Sandpiper in Wisconsin.
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 →
Bayfield519871970
Rolling Pr420101966
Hudson320231966
Stratford320241967
Beaver Dam320041967
Gresham320242018
Raymond320241966
Minong220111980
Dresser220181968
Gilman220231967
Colby220142001
Amnicon Falls220032003
New Lisbon220051969
Eden220191984
Wiota220241966
Kiel220221998
Stetsonville220211999
Chaffey119831983
Iron River120231970
Grand View120091971
Shanagolden119911980
Montreal120221979
Land O Lakes119971997
Loraine120131976
Cumberland119701966

Spotted Sandpiper Population Trend in Other States

alabamaalaskaarizonacaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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