BirdAnalyst
Species · New Hampshire · BBS 2025 Release · 1966–2024

Spotted Sandpiper Population Trend in New Hampshire

All statesShorebirds

Spotted Sandpiper in New Hampshire has fallen sharply: down 58% on the route-weighted index since 1968.

-58%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 →
20Routes 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 →
47YearsYears 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 New HampshireNotable 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 New Hampshire: down 58% on the route-weighted index since 1968.

Spotted Sandpiper Population Forecast in New Hampshire

If the recent trend holds, Spotted Sandpiper in New Hampshire is projected to stay roughly flat through 2028, near 0.02 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±62%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028TrendPercent 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 →
0.02Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2595% 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 →
±62%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 New Hampshire is projected to stay roughly flat through 2028, near 0.02 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±62%, with 100% of held-out values landing inside the 95% band.19662028
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 →
20240.040.000.27
20250.040.000.27
20260.040.000.26
20270.030.000.26
20280.020.000.25

Spotted Sandpiper Survey Routes in New Hampshire

Routes recording Spotted Sandpiper in New Hampshire.
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 →
Fitzwilliam219891972
Hopkinton219831980
Mt Chocorua220191966
Walpole220041976
Lempster219921974
Clarksville220051967
Peterborough119781969
Brentwood119731973
Dover119921971
Epsom119701970
Concord120042004
Canterbury120092007
Wilmot120231997
Marlow119871987
Jefferson Hl120021967
Franconia120091969
Milan120081967
Stratford120191966
Dixvil Notch119811967
Glen120192019

Spotted Sandpiper Population Trend in Other States

alabamaalaskaarizonacaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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