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Species · Alaska · BBS 2026 Release · 1966–2025

Common Raven Population Trend in Alaska

All statesGeneralists

Common Raven in Alaska has risen sharply: up 53% on the route-weighted index since 1972.

+53%Since 1972TrendPercent 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 →
132Routes 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 →
51YearsYears 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 AlaskaNotable 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 risen sharply in Alaska: up 53% on the route-weighted index since 1972.

Common Raven Population Forecast in Alaska

If the recent trend holds, Common Raven in Alaska is projected to fall about 22% by 2030 — from 6.1 in 2025 to a central estimate of 4.7 (95% range 0.00–12). A 5-year backtest shows a typical error of ±8.9%, with 100% of held-out values landing inside the 95% band.

-22%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 →
4.7Projected 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 →
0.00–1295% 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 →
±8.9%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 Alaska is projected to fall about 22% by 2030 — from 6.1 in 2025 to a central estimate of 4.7 (95% range 0.00–12). A 5-year backtest shows a typical error of ±8.9%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20264.90.0012
20274.90.0012
20284.80.0012
20294.80.0012
20304.70.0012

Common Raven Survey Routes in Alaska

Routes recording Common Raven in Alaska.
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 →
Sitka (Short)6919921984
Juneau6220251983
Galena (Short)3520251987
Juneau Alt3219861984
Ketchikan2320221971
Sitka2220241993
Thorne Bay2120121989
Dillingham (Short)1719841984
Happy Valley1720251993
Dillingham1620191993
Yakutat (Short)1319841984
Coldfoot1320251994
Ruby1320251994
Northway1220251992
Haines1220251972
Kotzebue1220252001
Whale Pass1120241997
Zarembo1120241993
Cordova1020241983
Yakutat1020251994
Thorne Bay 21020252013
Nicholai Sl1020251994
Petersville1020251986
Tower Bluffs820251996
Homer819821978

Common Raven Population Trend in Other States

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