BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Dusky Grouse In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

Dusky Grouse in Southern Rockies / Colorado Plateau has fallen sharply: down 68% on the route-weighted index since 1975.

-68%Since 1975
56Routes In Region
38Years

Notable Signals

long arc declinecomputed index

Dusky Grouse has fallen sharply in Southern Rockies / Colorado Plateau: down 68% on the route-weighted index since 1975.

Forecast

If the recent trend holds, Dusky Grouse in Southern Rockies / Colorado Plateau is projected to fall about 44% by 2029 — from 0.05 in 2024 to a central estimate of 0.03 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±86.3%, with 100% of held-out values landing inside the 95% band.

-44%Change by 2029
0.03Projected 2029 index
0.00–0.0995% range
±86.3%Backtest error
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 index95% low95% high
20250.030.000.09
20260.030.000.09
20270.030.000.09
20280.030.000.09
20290.030.000.09

Routes In Southern Rockies / Colorado Plateau

Routes recording Dusky Grouse in Southern Rockies / Colorado Plateau.
Pagosa SpgsCOLORADO51975
RadiumCOLORADO41998
Colona 2COLORADO22021
Blackhead PkCOLORADO22021
Dunckley PasCOLORADO22024
Yellowjacket PassCOLORADO22018
VallecitosNEW-MEXICO21999
Dry ParkARIZONA12010
YampaCOLORADO12007
Douglas PassCOLORADO12024
AspenCOLORADO11998
Cheesman LkCOLORADO12015
DeltaCOLORADO11976
ColonaCOLORADO12007
WaldenCOLORADO12008
Lost LakeCOLORADO12015
Willow PeakCOLORADO12016
UncompahgreCOLORADO12023
CastletonCOLORADO12013
GuffeyCOLORADO12006
Dolores RivCOLORADO12015
SummitvilleCOLORADO12024
Buffalo ParkCOLORADO11994
Deadman Rd.COLORADO12006
FlattopsCOLORADO12012

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