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

Spotted Sandpiper Population Trend in Illinois

All statesShorebirds

Spotted Sandpiper in Illinois has declined: down 33% on the route-weighted index since 1972.

-33%Since 1972TrendPercent 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 StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
47YearsYears 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 IllinoisNotable 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 Spotted Sandpiper in Illinois. See the full index history below.

Spotted Sandpiper Population Forecast in Illinois

If the recent trend holds, Spotted Sandpiper in Illinois is projected to rise about 23% by 2029 — from 0.05 in 2024 to a central estimate of 0.07 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±168.5%, with 100% of held-out values landing inside the 95% band.

+23%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 →
0.07Projected 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 →
0.00–0.2295% 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 →
±168.5%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 Illinois is projected to rise about 23% by 2029 — from 0.05 in 2024 to a central estimate of 0.07 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±168.5%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20250.060.000.22
20260.060.000.22
20270.070.000.22
20280.070.000.22
20290.070.000.22

Spotted Sandpiper Survey Routes in Illinois

Routes recording Spotted Sandpiper in Illinois.
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 →
Monticello320092009
Union320172011
Barrington219991977
Greenview220232023
Guilford120122010
Holcomb120082006
Cherry Val119941994
Itasca119981974
Atkinson120112011
Geneseo119971975
Payson120242024
Sheffield120161967
Buda120231986
Compton120181997
Streator119861981
Wayne120241972
Newark120111990
Sherburnvill120182009
New Lenox120171967
Gulfport120162008
Williamsfld119901990
Cameron120232023
Monica120112002
Deer Creek119941989
Minonk119991992

Spotted Sandpiper Population Trend in Other States

alabamaalaskaarizonacaliforniacoloradoconnecticutdelawaregeorgiaidahoindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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