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

Upland Sandpiper Population Trend in Colorado

All statesGrassland birds

Upland Sandpiper in Colorado has collapsed: down 94% on the route-weighted index since 1972.

-94%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 →
16Routes 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 →
51YearsYears 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 ColoradoNotable 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 →

Upland Sandpiper has collapsed in Colorado: down 93% on the route-weighted index since 1972.

Upland Sandpiper Population Forecast in Colorado

If the recent trend holds, Upland Sandpiper in Colorado is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.85). A 5-year backtest shows a typical error of ±1176.8%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.00Projected 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 →
0.00–0.8595% 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 →
±1176.8%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 Colorado is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.85). A 5-year backtest shows a typical error of ±1176.8%, 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 →
20250.000.000.85
20260.000.000.85
20270.000.000.85
20280.000.000.85
20290.000.000.85

Upland Sandpiper Survey Routes in Colorado

Routes recording Upland 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 →
Fleming620062006
Two Buttes519841974
Hudson419991988
Waverly420181988
Neegrande320041992
Amherst219991992
Lamar219841974
Kirk220132013
Pinneo120191975
Bethune119891989
Last Chance119811981
Abarr120241968
Grover120242021
Stoneham120122008
Fort Morgan120231998
Julesburg120211998

Upland Sandpiper Population Trend in Other States

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

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