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Species · Oregon · BBS 2026 Release · 1966–2025

Dusky Grouse Population Trend in Oregon

All statesGame birds

Dusky Grouse in Oregon has surged: up 156% on the route-weighted index since 1998.

+156%Since 1998TrendPercent 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 →
13Routes 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 →
20YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Dusky Grouse Trends in OregonNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Dusky Grouse in Oregon. See the full index history below.

Dusky Grouse Population Forecast in Oregon

If the recent trend holds, Dusky Grouse in Oregon is projected to fall about 51% by 2030 — from 0.08 in 2025 to a central estimate of 0.04 (95% range 0.01–0.07). A 5-year backtest shows a typical error of ±75.3%, with 80% of held-out values landing inside the 95% band.

-51%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 →
0.04Projected 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 →
0.01–0.0795% 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 →
±75.3%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, Dusky Grouse in Oregon is projected to fall about 51% by 2030 — from 0.08 in 2025 to a central estimate of 0.04 (95% range 0.01–0.07). A 5-year backtest shows a typical error of ±75.3%, with 80% of held-out values landing inside the 95% band.19942030
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 →
20260.040.010.07
20270.040.010.07
20280.040.010.07
20290.040.010.07
20300.040.010.07

Dusky Grouse Survey Routes in Oregon

Routes recording Dusky Grouse in Oregon.
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 →
Howard Mdws.820252008
Albee120132013
Flora120232017
Eagle Creek120221996
Wickiup120152015
Mount Vernon120051996
Hash Rock120242024
Hells Canyon119981998
Desolation120072007
Ochoco120001994
Barnhouse120242009
Silvies120242024
Donelly 2120182018

Dusky Grouse Population Trend in Other States

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