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

Western Grebe In Sierra Nevada

All regionsSierra NevadaWetland birds

Western Grebe in Sierra Nevada has held roughly steady: up 7% on the route-weighted index since 1988.

+7%Since 1988
4Routes In Region
35Years

Notable Signals

No notable trend signals for Western Grebe in Sierra Nevada. See the full index history below.

Forecast

If the recent trend holds, Western Grebe in Sierra Nevada is projected to fall about 27% by 2029 — from 0.68 in 2024 to a central estimate of 0.50 (95% range 0.00–2.4). A 5-year backtest shows a typical error of ±31.3%, with 100% of held-out values landing inside the 95% band.

-27%Change by 2029
0.50Projected 2029 index
0.00–2.495% range
±31.3%Backtest error
19862029
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
20250.540.002.4
20260.530.002.4
20270.520.002.4
20280.510.002.4
20290.500.002.4

Routes In Sierra Nevada

Routes recording Western Grebe in Sierra Nevada.
Eagle LakeCALIFORNIA132024
ChilcootCALIFORNIA31998
SattleyCALIFORNIA22019
GeneseeCALIFORNIA12019

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