BirdAnalyst
Species · Vermont · BBS 2025 Release · 1966–2024

Hooded Merganser Population Trend in Vermont

All statesWaterfowl

Hooded Merganser in Vermont has surged: up 350% on the route-weighted index since 1992.

+350%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 →
12Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
17YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Hooded Merganser Trends in VermontNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Hooded Merganser has surged in Vermont: up 349% on the route-weighted index since 1992.

Hooded Merganser Survey Routes in Vermont

Routes recording Hooded Merganser in Vermont.
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 →
Post Mills420242021
Landgrove120242024
Gaysville120082004
Shaftsbury120242024
S Wallingfrd120132004
W Rutland120242015
St Johnsbury120121992
East Haven120242021
Middlesex119861974
East Calais120042001
Greensboro120042004
Grand Isle120242024

Hooded Merganser Population Trend in Other States

alabamaalaskaarkansascoloradoconnecticutidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-yorknorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexaswashingtonwest-virginiawisconsinwyoming

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