BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Pied-billed Grebe In Sierra Nevada

All regionsSierra NevadaWetland birds

Pied-billed Grebe in Sierra Nevada has fallen sharply: down 65% on the route-weighted index since 1975.

-65%Since 1975
12Routes In Region
38Years

Notable Signals

long arc declinecomputed index

Pied-billed Grebe has fallen sharply in Sierra Nevada: down 65% on the route-weighted index since 1975.

Forecast

If the recent trend holds, Pied-billed Grebe in Sierra Nevada is projected to rise about 50% by 2026 — from 0.06 in 2021 to a central estimate of 0.09 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±88.7%, with 100% of held-out values landing inside the 95% band.

+50%Change by 2026
0.09Projected 2026 index
0.00–0.3695% range
±88.7%Backtest error
19732026
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
20220.100.000.37
20230.100.000.36
20240.100.000.36
20250.100.000.36
20260.090.000.36

Routes In Sierra Nevada

Routes recording Pied-billed Grebe in Sierra Nevada.
Butte MeadowCALIFORNIA21974
Hat CreekCALIFORNIA22018
Eagle LakeCALIFORNIA12019
Tuolumne GroveCALIFORNIA12021
SattleyCALIFORNIA12019
GeneseeCALIFORNIA12012
Higgins CornCALIFORNIA12003
Chaos CraterCALIFORNIA11994
GoumazCALIFORNIA12011
PaxtonCALIFORNIA12011
PlacervilleCALIFORNIA11999
Last ChanceCALIFORNIA12019

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