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Species · Washington · BBS 2025 Release · 1966–2024

Sooty Grouse Population Trend in Washington

All statesGeneralists

Sooty Grouse in Washington has edged up: up 12% on the route-weighted index since 1971.

+12%Since 1971
34Routes In State
54Years

Notable Sooty Grouse Trends in Washington

No notable trend signals for Sooty Grouse in Washington. See the full index history below.

Sooty Grouse Population Forecast in Washington

If the recent trend holds, Sooty Grouse in Washington is projected to rise about 169% by 2029 — from 0.16 in 2024 to a central estimate of 0.42 (95% range 0.05–0.80). A 5-year backtest shows a typical error of ±73.9%, with 100% of held-out values landing inside the 95% band.

+169%Change by 2029
0.42Projected 2029 index
0.05–0.8095% range
±73.9%Backtest error
19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.420.050.79
20260.420.050.79
20270.420.050.79
20280.420.050.79
20290.420.050.80

Sooty Grouse Survey Routes in Washington

Routes recording Sooty Grouse in Washington.
No Cascades820191988
Mt. Adams820231993
Cougar520231976
Packwood420111975
Cascade Riv320061988
Mt Rainier320211991
Ozette220241974
Montesand220241990
Ronald220232015
Ellensburg220182011
Mazama220102010
Pe Ell219971995
Greenwater220242024
Newhalem120231968
Taholah120121976
Kamilche120052005
E. Mt. Adams120241997
Bunker Hill120021968
Rimrock120231973
Kendall120031986
Glacier120241976
Raymond 2120232023
Mendota119811980
Index 2120232018
White Chuck120191994

Sooty Grouse Population Trend in Other States

alaskacaliforniaoregon

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.