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

Pied-billed Grebe Population Trend in Nebraska

All statesWetland birds

Pied-billed Grebe in Nebraska has increased: up 46% on the route-weighted index since 1970.

+46%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 →
45YearsYears 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 →

No notable trend signals for Pied-billed Grebe in Nebraska. See the full index history below.

Pied-billed Grebe Population Forecast in Nebraska

If the recent trend holds, Pied-billed Grebe in Nebraska is projected to rise about 78% by 2029 — from 0.17 in 2024 to a central estimate of 0.30 (95% range 0.00–0.67). A 5-year backtest shows a typical error of ±136.2%, with 80% of held-out values landing inside the 95% band.

+78%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 →
0.30Projected 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 →
0.00–0.6795% 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 →
±136.2%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 Nebraska is projected to rise about 78% by 2029 — from 0.17 in 2024 to a central estimate of 0.30 (95% range 0.00–0.67). A 5-year backtest shows a typical error of ±136.2%, with 80% of held-out values landing inside the 95% band.19682029
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 →
20250.290.000.66
20260.290.000.66
20270.290.000.66
20280.300.000.67
20290.300.000.67

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
Crescent Lk520171980
Table420242005
Gordon220182013
Kennedy220241977
Hampton120192019
Agate 2120232023
Oglala Nat. Grass.120002000
Arthur120192019
Brownlee120181994
Stratton120132013
Nenzel120242019
Richland120232023
Tilden120222019
Wheeler Co120241982
Eagle Creek120052005
Johnstown119691969
Piester Lake120181968

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 2026-05-22.