BirdAnalyst
Species · BCR 37 · BBS 2025 Release · 1966–2024

Pied-billed Grebe In Gulf Coastal Prairie

All regionsGulf Coastal PrairieWetland birds

Pied-billed Grebe in Gulf Coastal Prairie has surged: up 554% on the route-weighted index since 1975.

+554%Since 1975
31Routes In Region
40Years

Notable Signals

long arc increasecomputed index

Pied-billed Grebe has surged in Gulf Coastal Prairie: up 554% on the route-weighted index since 1975.

Forecast

If the recent trend holds, Pied-billed Grebe in Gulf Coastal Prairie is projected to fall about 35% by 2029 — from 1.2 in 2024 to a central estimate of 0.80 (95% range 0.00–1.7). A 5-year backtest shows a typical error of ±209.9%, with 100% of held-out values landing inside the 95% band.

-35%Change by 2029
0.80Projected 2029 index
0.00–1.795% range
±209.9%Backtest error
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 index95% low95% high
20250.770.001.6
20260.770.001.6
20270.780.001.7
20280.790.001.7
20290.800.001.7

Routes In Gulf Coastal Prairie

Routes recording Pied-billed Grebe in Gulf Coastal Prairie.
MauriceLOUISIANA172024
RichardLOUISIANA72018
Loyola Beach 2TEXAS62016
Ltl ChenierLOUISIANA52023
WinnieTEXAS41994
KatyTEXAS42024
Rock IslandTEXAS42015
EstherLOUISIANA32024
Sabine NwrLOUISIANA31993
Vinton 2LOUISIANA32023
San PedroTEXAS31998
Goliad PrairieTEXAS32007
CreoleLOUISIANA21975
Ville PlatteLOUISIANA22016
Forked IslandLOUISIANA22017
Forked Island 2LOUISIANA22011
IndianolaTEXAS22024
DanburyTEXAS22019
Loyola BeachTEXAS22008
Oyster LakeTEXAS22019
L. Atascosa NwrTEXAS22023
HackberryLOUISIANA12013
KaplanLOUISIANA12023
Sabine Nwr 2LOUISIANA12012
WoodlawnLOUISIANA12021

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