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Species · Washington · BBS 2025 Release · 1966–2024

Pied-billed Grebe Population Trend in Washington

All statesWetland birds

Pied-billed Grebe in Washington has fallen sharply: down 65% on the route-weighted index since 1973.

-65%Since 1973
43Routes In State
51Years

Notable Pied-billed Grebe Trends in Washington

long arc declinecomputed index

Pied-billed Grebe has fallen sharply in Washington: down 65% on the route-weighted index since 1973.

Pied-billed Grebe Population Forecast in Washington

If the recent trend holds, Pied-billed Grebe in Washington is projected to rise about 103% by 2029 — from 0.09 in 2024 to a central estimate of 0.18 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±120.2%, with 100% of held-out values landing inside the 95% band.

+103%Change by 2029
0.18Projected 2029 index
0.00–0.3995% range
±120.2%Backtest error
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 index95% low95% high
20250.180.000.39
20260.180.000.39
20270.180.000.39
20280.180.000.39
20290.180.000.39

Pied-billed Grebe Survey Routes in Washington

Routes recording Pied-billed Grebe in Washington.
Brewster620181981
Montesand519901990
Ewan420191985
Othello419911981
Issaquah319761976
Carnation320181989
Chewelah220081983
Wapato219941994
Tonasket220161983
Mendota219811981
Scootney Reservoir220212021
Keystone220151996
Omak Creek220242012
Moses Coulee220232011
Mesa220041997
Port Angeles120181971
Warm Beach120071968
Turnbull Nwr120231993
L Pend O Nwr120232011
Moses Lake120221973
Harrington119831983
Reardan120131998
Bunker Hill120192015
Mendota 2119951992
Rimrock119821982

Pied-billed Grebe Population Trend in Other States

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

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