BirdAnalyst
Species · BCR 5 · BBS 2025 Release · 1966–2024

Brewer's Sparrow In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestGeneralists

Brewer's Sparrow in Northern Pacific Rainforest has fallen sharply: down 60% on the route-weighted index since 1978.

-60%Since 1978
3Routes In Region
34Years

Notable Signals

long arc declinecomputed index

Brewer's Sparrow has fallen sharply in Northern Pacific Rainforest: down 60% on the route-weighted index since 1978.

Forecast

If the recent trend holds, Brewer's Sparrow in Northern Pacific Rainforest is projected to fall about 57% by 2024 — from 0.05 in 2019 to a central estimate of 0.02 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±57%, with 100% of held-out values landing inside the 95% band.

-57%Change by 2024
0.02Projected 2024 index
0.00–0.1795% range
±57%Backtest error
19702024
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
20200.030.000.18
20210.030.000.17
20220.030.000.17
20230.030.000.17
20240.020.000.17

Routes In Northern Pacific Rainforest

Routes recording Brewer's Sparrow in Northern Pacific Rainforest.
Mt ShastaCALIFORNIA42019
RuchOREGON32000
Cool CampOREGON11970

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