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

Common Raven Population Trend in New Hampshire

All statesGeneralists

Common Raven in New Hampshire has surged: up 951% on the route-weighted index since 1968.

+951%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 →
26Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Raven 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 increasecomputed 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 →

Common Raven has surged in New Hampshire: up 951% on the route-weighted index since 1968.

Common Raven Population Forecast in New Hampshire

If the recent trend holds, Common Raven in New Hampshire is projected to rise about 18% by 2030 — from 2.5 in 2025 to a central estimate of 3.0 (95% range 2.0–3.9). A 5-year backtest shows a typical error of ±18.3%, with 80% of held-out values landing inside the 95% band.

+18%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 →
3.0Projected 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 →
2.0–3.995% 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 →
±18.3%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, Common Raven in New Hampshire is projected to rise about 18% by 2030 — from 2.5 in 2025 to a central estimate of 3.0 (95% range 2.0–3.9). A 5-year backtest shows a typical error of ±18.3%, with 80% of held-out values landing inside the 95% band.19662030
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 →
20262.81.83.7
20272.81.93.8
20282.91.93.8
20292.92.03.9
20303.02.03.9

Common Raven Survey Routes in New Hampshire

Routes recording Common Raven 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 →
Dixvil Notch720161966
Dixville Notch 2720252019
Wilmot620251983
Glen620251976
Jeffers Ntch620251993
Strafford520241987
Hopkinton420241988
East Kingston420252002
Fitzwilliam320252010
Dover320251993
Gilmantn I W320251995
Mt Chocorua320251972
Walpole320251989
Lempster320251991
Peterborough220251982
Epsom220252000
Crawford Not219751969
Milan220251966
Clarksville220251967
Brentwood119981998
Concord120251995
Canterbury120231992
Marlow120251976
Jefferson Hl120231967
Franconia120251971

Common Raven Population Trend in Other States

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