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

Western Grebe Population Trend in Nebraska

All statesWetland birds

Western Grebe in Nebraska has edged down: down 17% on the route-weighted index since 1994.

-17%Since 1994TrendPercent 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 →
21YearsYears 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 NebraskaNotable 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 Western Grebe in Nebraska. See the full index history below.

Western Grebe Population Forecast in Nebraska

If the recent trend holds, Western Grebe in Nebraska is projected to fall about 45% by 2029 — from 0.08 in 2024 to a central estimate of 0.05 (95% range 0.00–0.38). A 5-year backtest shows a typical error of ±125.9%, with 100% of held-out values landing inside the 95% band.

-45%Change by 2029TrendPercent 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 →
0.05Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.3895% 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 →
±125.9%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, Western Grebe in Nebraska is projected to fall about 45% by 2029 — from 0.08 in 2024 to a central estimate of 0.05 (95% range 0.00–0.38). A 5-year backtest shows a typical error of ±125.9%, with 100% of held-out values landing inside the 95% band.19912029
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 →
20250.070.000.40
20260.060.000.40
20270.060.000.39
20280.050.000.39
20290.050.000.38

Western Grebe Survey Routes in Nebraska

Routes recording Western Grebe in Nebraska.
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 →
Brownlee420241992
Crescent Lk220131991
Nenzel120212019
Piester Lake120182018
Kennedy120082008

Western Grebe Population Trend in Other States

arizonacaliforniacoloradoidahokansasminnesotamontananevadanew-mexiconorth-dakotaoregonsouth-dakotautahwashingtonwyoming

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