BirdAnalyst
Species · Pennsylvania · BBS 2025 Release · 1966–2024

Common Raven Population Trend in Pennsylvania

All statesGeneralists

Common Raven in Pennsylvania has surged: up 21× on the route-weighted index since 1969.

21×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 →
56YearsYears 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 21× 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 stay roughly flat through 2029, near 1.5 (95% range 1.2–1.9). A 5-year backtest shows a typical error of ±16.8%, with 60% of held-out values landing inside the 95% band.

-8%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 →
1.5Projected 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 →
1.2–1.995% 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 →
±16.8%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 stay roughly flat through 2029, near 1.5 (95% range 1.2–1.9). A 5-year backtest shows a typical error of ±16.8%, 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 →
20251.41.11.8
20261.51.11.8
20271.51.11.8
20281.51.21.9
20291.51.21.9

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 →
Arnot1420241989
Roulette 21020242022
Stoneybreak820242000
Little Marsh720241993
Waterstreet720241989
Ferris Crnrs620242011
Lynch620241985
Ansonia620242002
Espyville519891989
Cherry Sprs520231974
Mawr Glen520241966
Peru Mills520242002
Ltl Pine Cr520241990
N Washington420151988
Ridgway420181988
Ramsey420231978
Rosecrans420221977
English Ctr419881966
Pocono Summit420241992
Geeseytown420241987
New Ringgold420241968
Tussey Mtn.420231993
Rush320242008
Hop Bottom320241999
Bald Eagle320241992

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 2026-05-22.