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

Spotted Sandpiper Population Trend in Idaho

All statesShorebirds

Spotted Sandpiper in Idaho has fallen sharply: down 54% on the route-weighted index since 1970.

-54%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 →
56Routes 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 →
57YearsYears 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 IdahoNotable 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 →

Spotted Sandpiper has fallen sharply in Idaho: down 54% on the route-weighted index since 1970.

Spotted Sandpiper Population Forecast in Idaho

If the recent trend holds, Spotted Sandpiper in Idaho is projected to rise about 51% by 2030 — from 0.77 in 2025 to a central estimate of 1.2 (95% range 0.03–2.3). A 5-year backtest shows a typical error of ±98.2%, with 100% of held-out values landing inside the 95% band.

+51%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 →
1.2Projected 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 →
0.03–2.395% 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 →
±98.2%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 Idaho is projected to rise about 51% by 2030 — from 0.77 in 2025 to a central estimate of 1.2 (95% range 0.03–2.3). A 5-year backtest shows a typical error of ±98.2%, 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 →
20261.20.032.3
20271.20.032.3
20281.20.032.3
20291.20.032.3
20301.20.032.3

Spotted Sandpiper Survey Routes in Idaho

Routes recording Spotted Sandpiper in Idaho.
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 →
Henry2119811981
Nezperce1920121968
Golden1720161987
Nezperce Nf919991992
N Fork Cda R620191993
Centerville620251972
Cascade419841983
Cape Horn420251972
Sunbeam420251994
Featherville420251989
Tractor Flat320192019
Triangle320151985
Baldy Mountain320152013
Yellow Pine320161989
Cedar Hill320211992
Daniels Res319971988
Gifford220151971
Baker220241974
Pocatello219901980
Coolin220251986
Rochat Divde220251994
Silver City220141997
Bates220091992
Blackft Res120161984
Naples120251977

Spotted Sandpiper Population Trend in Other States

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

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.