BirdAnalyst
Species · Colorado · BBS 2026 Release · 1966–2025

Spotted Sandpiper Population Trend in Colorado

All statesShorebirds

Spotted Sandpiper in Colorado has edged down: down 17% on the route-weighted index since 1970.

-17%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 →
98Routes 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 →
56YearsYears 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 stay roughly flat through 2030, near 0.39 (95% range 0.12–0.65). A 5-year backtest shows a typical error of ±49.6%, with 100% of held-out values landing inside the 95% band.

+4%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 →
0.39Projected 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 →
0.12–0.6595% 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 →
±49.6%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 stay roughly flat through 2030, near 0.39 (95% range 0.12–0.65). A 5-year backtest shows a typical error of ±49.6%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20260.380.120.65
20270.390.120.65
20280.390.120.65
20290.390.120.65
20300.390.120.65

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 →
Stillwater Pass 21020252010
Tincup820251994
Fox Creek520251993
Pagosa Spgs419731969
Stillwater Pass420091999
Radium420131998
Fleming320062006
Tarryall320251988
Guffey319901990
Lake City320031998
Marshall Pas320141995
Douglas Pass220231986
Blanca219861986
Wray Gulch220251988
Willow Peak220181988
Dolores Riv220251994
Cortez220071989
Deadman Rd.220162015
Kirk220232023
Cokedale219981998
Comanche Pk220002000
Baxter Pass220241995
Weston Pass220001994
Powderhorn220231995
Animas220001996

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 2026-08-14.