BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Great Gray Owl In Northern Rockies

All regionsNorthern RockiesGeneralists

Great Gray Owl in Northern Rockies has fallen sharply: down 68% on the route-weighted index since 1992.

-68%Since 1992TrendPercent 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 →
11Routes 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 →
14YearsYears 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 Great Gray Owl in Northern Rockies. See the full index history below.

Routes In Northern Rockies

Routes recording Great Gray Owl in Northern Rockies.
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 →
NaplesIDAHO21981
Lolo PassIDAHO12014
Cape HornIDAHO12023
CentervilleIDAHO12005
BurgdorfIDAHO12009
Libby DamMONTANA11985
WoodmanMONTANA11999
SulaMONTANA12021
Cramer CreekMONTANA12017
FloraOREGON11999
Eagle CreekOREGON12003

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