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Species · Utah · BBS 2026 Release · 1966–2025

Clark's Grebe Population Trend in Utah

All statesWetland birds

Clark's Grebe in Utah has surged: up 931% on the route-weighted index since 1992.

+931%Since 1992TrendPercent 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 →
9Routes 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 →
31YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Clark's Grebe Trends in UtahNotable 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 Clark's Grebe in Utah. See the full index history below.

Clark's Grebe Population Forecast in Utah

If the recent trend holds, Clark's Grebe in Utah is projected to stay roughly flat through 2030, near 0.49 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±30.8%, with 100% of held-out values landing inside the 95% band.

-1%Change by 2030TrendPercent 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 →
0.49Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–1.195% 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 →
±30.8%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, Clark's Grebe in Utah is projected to stay roughly flat through 2030, near 0.49 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±30.8%, with 100% of held-out values landing inside the 95% band.19862030
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 →
20260.460.001.0
20270.470.001.0
20280.480.001.1
20290.490.001.1
20300.490.001.1

Clark's Grebe Survey Routes in Utah

Routes recording Clark's Grebe in Utah.
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 →
Bear River3420251992
Ferron520162007
Kamas420242019
Neponset Res220161997
Goshen220121998
Saleratus Cr120112011
E. Bear Lake120011999
Lynn120211986
Callao120132011

Clark's Grebe Population Trend in Other States

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Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.