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Species · Nebraska · BBS 2026 Release · 1966–2025

Pied-billed Grebe Population Trend in Nebraska

All statesWetland birds

Pied-billed Grebe in Nebraska has surged: up 83% on the route-weighted index since 1970.

+83%Since 1970TrendPercent 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 →
18Routes 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 →
46YearsYears 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 NebraskaNotable 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 increasecomputed 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 →

Pied-billed Grebe has surged in Nebraska: up 83% on the route-weighted index since 1970.

Pied-billed Grebe Population Forecast in Nebraska

If the recent trend holds, Pied-billed Grebe in Nebraska is projected to rise about 93% by 2030 — from 0.15 in 2025 to a central estimate of 0.29 (95% range 0.00–0.66). A 5-year backtest shows a typical error of ±168%, with 100% of held-out values landing inside the 95% band.

+93%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 →
0.29Projected 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 →
0.00–0.6695% 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 →
±168%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 Nebraska is projected to rise about 93% by 2030 — from 0.15 in 2025 to a central estimate of 0.29 (95% range 0.00–0.66). A 5-year backtest shows a typical error of ±168%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20260.280.000.65
20270.280.000.65
20280.280.000.65
20290.290.000.66
20300.290.000.66

Pied-billed Grebe Survey Routes in Nebraska

Routes recording Pied-billed 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 →
Swan Lake2320211983
Piester Lake620251968
Table420242005
Crescent Lk320251980
Gordon220182013
Kennedy220241977
Hampton120192019
Agate 2120232023
Oglala Nat. Grass.120002000
Arthur120192019
Brownlee120181994
Stratton120132013
Nenzel120242019
Richland120232023
Tilden120222019
Wheeler Co120241982
Eagle Creek120052005
Johnstown119691969

Pied-billed Grebe Population Trend in Other States

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

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