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

Western Grebe Population Trend in Washington

All statesWetland birds

Western Grebe in Washington has fallen sharply: down 61% on the route-weighted index since 1990.

-61%Since 1990TrendPercent 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 →
7Routes 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 Western Grebe Trends in WashingtonNotable 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 →

Western Grebe has fallen sharply in Washington: down 61% on the route-weighted index since 1990.

Western Grebe Survey Routes in Washington

Routes recording Western Grebe in Washington.
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 →
Hanford Site519961996
Moses Lake220161988
Horn Rapids220212013
Brewster119991992
Ewan120122012
Mesa119971996
Keystone120221997

Western Grebe Population Trend in Other States

arizonacaliforniacoloradoidahokansasminnesotamontananebraskanevadanew-mexiconorth-dakotaoregonsouth-dakotautahwyoming

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