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

Hooded Merganser In Great Basin

All regionsGreat BasinWaterfowl

Hooded Merganser in Great Basin has declined: down 48% on the route-weighted index since 1989.

-48%Since 1989TrendPercent 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 →
9Routes 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 →
13YearsYears 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 Hooded Merganser in Great Basin. See the full index history below.

Routes In Great Basin

Routes recording Hooded Merganser 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 →
JosephOREGON62005
NighthawkWASHINGTON22013
Dell SpringOREGON11972
NewhalemWASHINGTON11989
TwispWASHINGTON12024
KendallWASHINGTON12021
CarltonWASHINGTON11998
Columbia NwrWASHINGTON12021
Turnbull NwrWASHINGTON12017

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