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Species · Pennsylvania · BBS 2026 Release · 1966–2025

Common Raven Population Trend in Pennsylvania

All statesGeneralists

Common Raven in Pennsylvania has surged: up 22× on the route-weighted index since 1969.

22×Since 1969TrendPercent 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 →
103Routes 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 Common Raven Trends in PennsylvaniaNotable 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 Pennsylvania: up 22× on the route-weighted index since 1969.

Common Raven Population Forecast in Pennsylvania

If the recent trend holds, Common Raven in Pennsylvania is projected to fall about 18% by 2030 — from 2.0 in 2025 to a central estimate of 1.6 (95% range 1.2–2.0). A 5-year backtest shows a typical error of ±22.3%, with 40% 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 →
1.6Projected 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 →
1.2–2.095% 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 →
±22.3%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 Pennsylvania is projected to fall about 18% by 2030 — from 2.0 in 2025 to a central estimate of 1.6 (95% range 1.2–2.0). A 5-year backtest shows a typical error of ±22.3%, with 40% 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 →
20261.51.11.9
20271.51.21.9
20281.61.21.9
20291.61.21.9
20301.61.22.0

Common Raven Survey Routes in Pennsylvania

Routes recording Common Raven in Pennsylvania.
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 →
Clearfield3820252012
Arnot1320251989
Broad Mtn.1220251993
Stoneybreak820242000
Little Marsh720241993
Bow Bridge720252000
Waterstreet720241989
Wild Creek720252009
Ansonia720252002
Ferris Crnrs620242011
Ramsey620251978
Espyville519891989
Mawr Glen520251966
Ltl Pine Cr520241990
Wyalusing520252004
N Washington420151988
Ridgway420181988
Rosecrans420221977
English Ctr419881966
Austinville420251993
Pocono Summit420251992
Susquehanna420252005
Geeseytown420251987
New Ringgold420241968
Tussey Mtn.420251993

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonrhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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