BirdAnalyst
Species · BCR 34 · BBS 2025 Release · 1966–2024

Pied-billed Grebe In Sierra Madre Occidental

All regionsSierra Madre OccidentalWetland birds

Pied-billed Grebe in Sierra Madre Occidental has fallen sharply: down 70% on the route-weighted index since 1992.

-70%Since 1992
4Routes In Region
22Years

Notable Signals

long arc declinecomputed index

Pied-billed Grebe has fallen sharply in Sierra Madre Occidental: down 70% on the route-weighted index since 1992.

Forecast

If the recent trend holds, Pied-billed Grebe in Sierra Madre Occidental is projected to stay roughly flat through 2028, near 0.07 (95% range 0.00–0.16). A 5-year backtest shows a typical error of ±103.7%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028
0.07Projected 2028 index
0.00–0.1695% range
±103.7%Backtest error
19852028
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
20240.080.000.16
20250.080.000.16
20260.080.000.16
20270.080.000.16
20280.070.000.16

Routes In Sierra Madre Occidental

Routes recording Pied-billed Grebe in Sierra Madre Occidental.
PrescottARIZONA12019
AlpineARIZONA12023
RedingtonARIZONA11994
Carr MtnARIZONA12015

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