BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Ruffed Grouse In Great Basin

All regionsGreat BasinGeneralists

Ruffed Grouse in Great Basin has declined: down 42% on the route-weighted index since 1972.

-42%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 →
32Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
44YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Ruffed Grouse in Great Basin. See the full index history below.

Forecast

If the recent trend holds, Ruffed Grouse in Great Basin is projected to stay roughly flat through 2029, near 0.02 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±65.6%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.02Projected 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 →
0.00–0.0595% 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 →
±65.6%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 →
19692029
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 →
20250.020.000.06
20260.020.000.05
20270.020.000.05
20280.020.000.05
20290.020.000.05

Routes In Great Basin

Routes recording Ruffed Grouse in Great Basin.
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 →
LeadoreIDAHO22008
SquirrelIDAHO22022
AsotinWASHINGTON21983
BickletonWASHINGTON21984
Magic MtnIDAHO12018
JoelIDAHO11990
BatesIDAHO12009
JarbidgeNEVADA12013
Humboldt NfNEVADA12015
JosephOREGON12022
Mt HoodOREGON11978
Camp ShermanOREGON11994
Picture FlatOREGON12009
ZumwaltOREGON12004
NewhalemWASHINGTON12017
TwispWASHINGTON12005
ReardanWASHINGTON11971
RimrockWASHINGTON11986
SnowdenWASHINGTON12015
KendallWASHINGTON12006
WinthropWASHINGTON12019
TonasketWASHINGTON12002
RonaldWASHINGTON12022
White ChuckWASHINGTON12013
CarltonWASHINGTON12013

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