BirdAnalyst
Species · BCR 23 · BBS 2025 Release · 1966–2024

Lesser Scaup In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionWaterfowl

Lesser Scaup in Prairie Hardwood Transition has collapsed: down 76% on the route-weighted index since 1968.

-76%Since 1968TrendPercent 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 →
8Routes 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 →
12YearsYears 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 →

long arc declinecomputed 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 →

Lesser Scaup has collapsed in Prairie Hardwood Transition: down 76% on the route-weighted index since 1968.

Routes In Prairie Hardwood Transition

Routes recording Lesser Scaup in Prairie Hardwood Transition.
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 →
OsseoMINNESOTA41967
Sherburne NrMINNESOTA31997
KnappMINNESOTA22003
GlenwoodMINNESOTA22019
HudsonWISCONSIN11975
DresserWISCONSIN11992
LoraineWISCONSIN11980
OmroWISCONSIN11986

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