BirdAnalyst
Species · New Hampshire · BBS 2026 Release · 1966–2025

Osprey Population Trend in New Hampshire

All statesBirds of prey

Osprey in New Hampshire has risen sharply: up 54% on the route-weighted index since 1991.

+54%Since 1991TrendPercent 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 →
15Routes 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 →
23YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Osprey 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 →

No notable trend signals for Osprey in New Hampshire. See the full index history below.

Osprey Population Forecast in New Hampshire

If the recent trend holds, Osprey in New Hampshire is projected to stay roughly flat through 2030, near 0.12 (95% range 0.05–0.19). A 5-year backtest shows a typical error of ±52.2%, with 60% of held-out values landing inside the 95% band.

n/aChange 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 →
0.12Projected 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 →
0.05–0.1995% 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 →
±52.2%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, Osprey in New Hampshire is projected to stay roughly flat through 2030, near 0.12 (95% range 0.05–0.19). A 5-year backtest shows a typical error of ±52.2%, with 60% of held-out values landing inside the 95% band.19742030
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 →
20260.110.040.18
20270.110.040.18
20280.110.040.18
20290.120.040.18
20300.120.050.19

Osprey Survey Routes in New Hampshire

Routes recording Osprey 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 →
Dover220212000
Fitzwilliam120252025
Hopkinton120232013
Epsom119911991
Concord120212016
Strafford120182018
East Kingston120172014
Mt Chocorua119971997
Walpole120131980
Lempster120222022
Jefferson Hl119741974
Milan120231994
Stratford120111998
Jeffers Ntch120162016
Clarksville120222022

Osprey Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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