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Species · Texas · BBS 2025 Release · 1966–2024

Pied-billed Grebe Population Trend in Texas

All statesWetland birds

Pied-billed Grebe in Texas has declined: down 45% on the route-weighted index since 1969.

-45%Since 1969TrendPercent 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 →
54Routes 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 →
48YearsYears 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 TexasNotable 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 Texas. See the full index history below.

Pied-billed Grebe Population Forecast in Texas

If the recent trend holds, Pied-billed Grebe in Texas is projected to stay roughly flat through 2029, near 0.08 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±242.2%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.08Projected 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 →
0.00–0.2095% 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 →
±242.2%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 Texas is projected to stay roughly flat through 2029, near 0.08 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±242.2%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20250.080.000.20
20260.080.000.20
20270.080.000.20
20280.080.000.20
20290.080.000.20

Pied-billed Grebe Survey Routes in Texas

Routes recording Pied-billed Grebe in Texas.
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 →
Panhandle2120162016
Loyola Beach 2620162010
Winnie419941994
Katy420242004
Rock Island420151972
Quitman Canyon 2420192018
Zapata319681968
Goliad Prairie320072004
Campbellton320171995
New Waverly319811978
Raymondville319811970
San Pedro319981998
L. Atascosa Nwr220232003
Indianola220241967
George West219941992
Danbury220191986
Valley Spgs219751975
Loyola Beach220081998
Oyster Lake220191998
Bear Mtn219921992
Weinert219921987
Pantex220231977
Waka220211978
Catarina 2220132013
Lag Atascosa119921992

Pied-billed Grebe Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseeutahvermontvirginiawashingtonwisconsinwyoming

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