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Species · Washington · BBS 2025 Release · 1966–2024

Red-necked Grebe Population Trend in Washington

All statesWetland birds

Red-necked Grebe in Washington has fallen sharply: down 72% on the route-weighted index since 1985.

-72%Since 1985TrendPercent 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 →
22YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Red-necked 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 →

Red-necked Grebe has fallen sharply in Washington: down 72% on the route-weighted index since 1985.

Red-necked Grebe Population Forecast in Washington

If the recent trend holds, Red-necked Grebe in Washington is projected to stay roughly flat through 2014, near 0.00 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±62.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2014TrendPercent 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 →
0.00Projected 2014 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0595% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±62.4%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Red-necked Grebe in Washington is projected to stay roughly flat through 2014, near 0.00 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±62.4%, with 100% of held-out values landing inside the 95% band.19832014
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20100.010.000.06
20110.010.000.05
20120.010.000.05
20130.000.000.05
20140.000.000.05

Red-necked Grebe Survey Routes in Washington

Routes recording Red-necked 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 →
Sullivan Lk319991999
Cusick120081988
L Pend O Nwr120011998
Nighthawk119931993
Curlew119941992
Sullivan Lake 2120082001
Twin Lakes120091983

Red-necked Grebe Population Trend in Other States

alaskaidahominnesotamontananorth-dakotaoregonwisconsinwyoming

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