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

Eared Grebe Population Trend in Idaho

All statesWetland birds

Eared Grebe in Idaho has fallen sharply: down 70% on the route-weighted index since 1983.

-70%Since 1983TrendPercent 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 →
10Routes 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 →
28YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Eared Grebe Trends in IdahoNotable 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 →

Eared Grebe has fallen sharply in Idaho: down 70% on the route-weighted index since 1983.

Eared Grebe Population Forecast in Idaho

If the recent trend holds, Eared Grebe in Idaho is projected to fall about 16% by 2029 — from 0.08 in 2024 to a central estimate of 0.07 (95% range 0.00–0.28). A 5-year backtest shows a typical error of ±197.1%, with 100% of held-out values landing inside the 95% band.

-16%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 →
0.07Projected 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 →
0.00–0.2895% 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 →
±197.1%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, Eared Grebe in Idaho is projected to fall about 16% by 2029 — from 0.08 in 2024 to a central estimate of 0.07 (95% range 0.00–0.28). A 5-year backtest shows a typical error of ±197.1%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.080.000.29
20260.070.000.29
20270.070.000.29
20280.070.000.28
20290.070.000.28

Eared Grebe Survey Routes in Idaho

Routes recording Eared Grebe in Idaho.
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 →
Preston619931991
Blackft Res519991986
Daniels Res419911991
Cascade219831983
Iron Springs220241988
Henry219811981
Kyle Canyon119971986
Springfield119981969
Triangle120211996
Magic Mtn120172017

Eared Grebe Population Trend in Other States

arizonacaliforniacoloradoiowakansasminnesotamontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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