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Species · Alaska · BBS 2026 Release · 1966–2025

Sooty Grouse Population Trend in Alaska

All statesGame birds

Sooty Grouse in Alaska has collapsed: down 83% on the route-weighted index since 1975.

-83%Since 1975TrendPercent 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 →
15Routes 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 →
45YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Sooty Grouse 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 declinecomputed 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 →

Sooty Grouse has collapsed in Alaska: down 83% on the route-weighted index since 1975.

Sooty Grouse Population Forecast in Alaska

If the recent trend holds, Sooty Grouse in Alaska is projected to fall about 100% by 2030 — from 0.93 in 2025 to a central estimate of 0.00 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±142.5%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–2.395% 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 →
±142.5%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, Sooty Grouse in Alaska is projected to fall about 100% by 2030 — from 0.93 in 2025 to a central estimate of 0.00 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±142.5%, with 100% of held-out values landing inside the 95% band.19722030
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 →
20260.000.002.3
20270.000.002.3
20280.000.002.3
20290.000.002.3
20300.000.002.3

Sooty Grouse Survey Routes in Alaska

Routes recording Sooty Grouse 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 →
Zimovia Strt2820251988
Haines1820251972
Kuiu Island820102004
Skagway520251994
Wrangell (Short)419841984
Hyder420091994
Zarembo220142000
Chichagof Is220241994
Juneau220251983
Petersburg119871987
Stikine River120221998
Juneau Alt119861984
Ketchikan120211974
Hoonah120241994
Mitkof Isle120251988

Sooty Grouse Population Trend in Other States

californiaoregonwashington

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