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

Brewer's Blackbird In Sierra Nevada

All regionsSierra NevadaGeneralists

Brewer's Blackbird in Sierra Nevada has fallen sharply: down 55% on the route-weighted index since 1970.

-55%Since 1970
37Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Brewer's Blackbird has fallen sharply in Sierra Nevada: down 55% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Brewer's Blackbird in Sierra Nevada is projected to fall about 51% by 2029 — from 13 in 2024 to a central estimate of 6.3 (95% range 0.00–20). A 5-year backtest shows a typical error of ±22.6%, with 100% of held-out values landing inside the 95% band.

-51%Change by 2029
6.3Projected 2029 index
0.00–2095% range
±22.6%Backtest error
19682029
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
20257.40.0021
20267.10.0021
20276.80.0020
20286.50.0020
20296.30.0020

Routes In Sierra Nevada

Routes recording Brewer's Blackbird in Sierra Nevada.
SattleyCALIFORNIA1432024
WoodfordsCALIFORNIA332024
KernvilleCALIFORNIA232008
Cottage SpgsCALIFORNIA201975
GoumazCALIFORNIA202011
Little TruckeeCALIFORNIA192023
GeneseeCALIFORNIA182024
PaxtonCALIFORNIA152024
Lassen ParkCALIFORNIA121987
Hat CreekCALIFORNIA102018
Butte MeadowCALIFORNIA62014
Last ChanceCALIFORNIA62019
JohnsvilleCALIFORNIA52019
LakeshoreCALIFORNIA52024
Meadow ValleyCALIFORNIA52024
CrestviewCALIFORNIA52024
Silver CityCALIFORNIA42013
Tuolumne GroveCALIFORNIA42024
ChilcootCALIFORNIA42024
Eagle LakeCALIFORNIA32024
Bass LakeCALIFORNIA32018
Higgins CornCALIFORNIA32024
Chaos CraterCALIFORNIA32012
Greenhorn MtCALIFORNIA22008
DownievilleCALIFORNIA22022

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