BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Gadwall In Sierra Nevada

All regionsSierra NevadaWaterfowl

Gadwall in Sierra Nevada has held roughly steady: down 5% on the route-weighted index since 1976.

-5%Since 1976TrendPercent 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 →
6Routes 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 →
16YearsYears 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 Gadwall in Sierra Nevada. See the full index history below.

Routes In Sierra Nevada

Routes recording Gadwall in Sierra Nevada.
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 →
SattleyCALIFORNIA22016
ChilcootCALIFORNIA22024
Last ChanceCALIFORNIA22013
GeneseeCALIFORNIA12006
Hat CreekCALIFORNIA11987
GoumazCALIFORNIA12009

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