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

Spotted Sandpiper Population Trend in Colorado

All statesShorebirds

Spotted Sandpiper in Colorado has edged down: down 25% on the route-weighted index since 1970.

-25%Since 1970TrendPercent 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 →
96Routes 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 →
55YearsYears 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 ColoradoNotable 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 Colorado. See the full index history below.

Spotted Sandpiper Population Forecast in Colorado

If the recent trend holds, Spotted Sandpiper in Colorado is projected to rise about 39% by 2029 — from 0.28 in 2024 to a central estimate of 0.39 (95% range 0.12–0.65). A 5-year backtest shows a typical error of ±59%, with 100% of held-out values landing inside the 95% band.

+39%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 →
0.39Projected 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 →
0.12–0.6595% 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 →
±59%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 Colorado is projected to rise about 39% by 2029 — from 0.28 in 2024 to a central estimate of 0.39 (95% range 0.12–0.65). A 5-year backtest shows a typical error of ±59%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.390.120.65
20260.390.120.65
20270.390.120.65
20280.390.120.65
20290.390.120.65

Spotted Sandpiper Survey Routes in Colorado

Routes recording Spotted Sandpiper in Colorado.
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 →
Dolores Riv620241994
Tincup620241994
Pagosa Spgs419731969
Stillwater Pass420091999
Radium420131998
Stillwater Pass 2420242010
Fleming320062006
Guffey319901990
Lake City320031998
Fox Creek320241993
Marshall Pas320141995
Douglas Pass220231986
Blanca219861986
Willow Peak220181988
Cortez220071989
Deadman Rd.220162015
Kirk220232023
Cokedale219981998
Comanche Pk220002000
Baxter Pass220241995
Weston Pass220001994
Powderhorn220231995
Animas220001996
Piceance Basin220061998
Elbert220052005

Spotted Sandpiper Population Trend in Other States

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

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