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

American Coot In Sierra Nevada

All regionsSierra NevadaWetland birds

American Coot in Sierra Nevada has fallen sharply: down 63% on the route-weighted index since 1974.

-63%Since 1974
8Routes In Region
30Years

Notable Signals

long arc declinecomputed index

American Coot has fallen sharply in Sierra Nevada: down 63% on the route-weighted index since 1974.

Forecast

If the recent trend holds, American Coot in Sierra Nevada is projected to fall about 17% by 2023 — from 0.21 in 2018 to a central estimate of 0.17 (95% range 0.00–0.65). A 5-year backtest shows a typical error of ±207.4%, with 100% of held-out values landing inside the 95% band.

-17%Change by 2023
0.17Projected 2023 index
0.00–0.6595% range
±207.4%Backtest error
19722023
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
20190.190.000.66
20200.180.000.66
20210.180.000.66
20220.180.000.65
20230.170.000.65

Routes In Sierra Nevada

Routes recording American Coot in Sierra Nevada.
Eagle LakeCALIFORNIA31975
Chaos CraterCALIFORNIA31993
GeneseeCALIFORNIA22018
Hat CreekCALIFORNIA22018
SattleyCALIFORNIA11997
GoumazCALIFORNIA11999
PlacervilleCALIFORNIA12010
Last ChanceCALIFORNIA12018

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