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Species · Illinois · BBS 2025 Release · 1966–2024

Upland Sandpiper Population Trend in Illinois

All statesGrassland birds

Upland Sandpiper in Illinois has declined: down 47% on the route-weighted index since 1968.

-47%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 →
51Routes 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Upland 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 Upland Sandpiper in Illinois. See the full index history below.

Upland Sandpiper Population Forecast in Illinois

If the recent trend holds, Upland Sandpiper in Illinois is projected to fall about 60% by 2029 — from 0.32 in 2024 to a central estimate of 0.13 (95% range 0.00–0.49). A 5-year backtest shows a typical error of ±84.7%, with 80% of held-out values landing inside the 95% band.

-60%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 →
0.13Projected 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 →
0.00–0.4995% 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 →
±84.7%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, Upland Sandpiper in Illinois is projected to fall about 60% by 2029 — from 0.32 in 2024 to a central estimate of 0.13 (95% range 0.00–0.49). A 5-year backtest shows a typical error of ±84.7%, with 80% 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 →
20250.130.000.49
20260.130.000.49
20270.130.000.49
20280.130.000.49
20290.130.000.49

Upland Sandpiper Survey Routes in Illinois

Routes recording Upland 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 →
Stillwell920241971
Monticello620241994
Dailey519961967
Pawnee419711967
Waynesville420182005
Buda320231997
Keithsburg320212011
Newark220181970
Williamsfld220011971
Fairbury220241979
Pontiac220161985
Milford220231997
Lake Summerset220182001
Clayton220172017
Gridley220242005
Harristown220172016
Shannon220182007
Le Roy220192019
Guilford119941994
Mill Creek120191970
Holcomb119841982
Atkinson120241966
Geneseo119861986
Putnam120191973
Compton119951991

Upland Sandpiper Population Trend in Other States

alaskacoloradoindianaiowakansasmainemarylandmassachusettsmichiganminnesotamissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatexasvermontvirginiawest-virginiawisconsinwyoming

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