BirdAnalyst
Species · Nevada · BBS 2026 Release · 1966–2025

Pied-billed Grebe Population Trend in Nevada

All statesWetland birds

Pied-billed Grebe in Nevada has held roughly steady: down 9% on the route-weighted index since 1992.

-9%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 →
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 →
32YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Pied-billed Grebe Trends in NevadaNotable 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 Pied-billed Grebe in Nevada. See the full index history below.

Pied-billed Grebe Population Forecast in Nevada

If the recent trend holds, Pied-billed Grebe in Nevada is projected to fall about 27% by 2030 — from 0.29 in 2025 to a central estimate of 0.21 (95% range 0.00–0.91). A 5-year backtest shows a typical error of ±251.2%, with 100% of held-out values landing inside the 95% band.

-27%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 →
0.21Projected 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 →
0.00–0.9195% 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 →
±251.2%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, Pied-billed Grebe in Nevada is projected to fall about 27% by 2030 — from 0.29 in 2025 to a central estimate of 0.21 (95% range 0.00–0.91). A 5-year backtest shows a typical error of ±251.2%, 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 →
20260.210.000.91
20270.210.000.91
20280.210.000.91
20290.210.000.91
20300.210.000.91

Pied-billed Grebe Survey Routes in Nevada

Routes recording Pied-billed Grebe in Nevada.
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 →
Cortez620252018
Dobbin Creek220181987
Bald Mtn.120191992
Sand Pass120122012
Ash Meadows120191994
Virgin Creek120161997
Nixon120222022
Fallon120072007
Gardnerville120111994
Beatty119861986

Pied-billed Grebe Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwisconsinwyoming

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