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

Northern Shoveler Population Trend in Iowa

All statesWaterfowl

Northern Shoveler in Iowa has risen sharply: up 73% on the route-weighted index since 1978.

+73%Since 1978TrendPercent 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 →
5Routes 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 →
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 Northern Shoveler Trends in IowaNotable 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 →

Northern Shoveler has risen sharply in Iowa: up 73% on the route-weighted index since 1978.

Northern Shoveler Survey Routes in Iowa

Routes recording Northern Shoveler in Iowa.
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 →
Scranton1119951974
Sioux City520231983
Burchinal220082008
Garner219781973
College Spgs119741974

Northern Shoveler Population Trend in Other States

alaskacaliforniacoloradodelawareidahoillinoisindianakansasminnesotamissourimontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonpennsylvaniasouth-dakotatexasutahwashingtonwisconsinwyoming

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