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

Common Raven Population Trend in New Hampshire

All statesGeneralists

Common Raven in New Hampshire has surged: up 11× on the route-weighted index since 1968.

11×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 →
58YearsYears 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 11× 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 fall about 15% by 2029 — from 3.5 in 2024 to a central estimate of 3.0 (95% range 2.0–3.9). A 5-year backtest shows a typical error of ±20.4%, with 60% of held-out values landing inside the 95% band.

-15%Change 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 →
3.0Projected 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 →
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 →
±20.4%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 fall about 15% by 2029 — from 3.5 in 2024 to a central estimate of 3.0 (95% range 2.0–3.9). A 5-year backtest shows a typical error of ±20.4%, with 60% of held-out values landing inside the 95% band.19662029
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 →
20252.81.83.7
20262.81.93.8
20272.91.93.8
20282.92.03.9
20293.02.03.9

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 →
Wilmot1020241983
Marlow1020241976
Franconia920241971
Lempster720241991
Dixvil Notch720161966
Dixville Notch 2720242019
Strafford520241987
Glen520241976
Hopkinton420241988
East Kingston420242002
Gilmantn I W320241995
Milan320241966
Dover220241993
Epsom220232000
Mt Chocorua220231972
Crawford Not219751969
Clarksville220241967
Peterborough120241982
Brentwood119981998
Fitzwilliam120242010
Concord120241995
Canterbury120231992
Walpole120241989
Jefferson Hl120231967
Stratford120211968

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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