BirdAnalyst
Species · BCR 4 · BBS 2025 Release · 1966–2024

Townsend's Warbler In BCR 4

All regionsBCR 4Forest birds

Townsend's Warbler in BCR 4 has increased: up 49% on the route-weighted index since 1984.

+49%Since 1984
39Routes In Region
42Years

Notable Signals

No notable trend signals for Townsend's Warbler in BCR 4. See the full index history below.

Forecast

If the recent trend holds, Townsend's Warbler in BCR 4 is projected to fall about 11% by 2029 — from 2.2 in 2024 to a central estimate of 2.0 (95% range 0.50–3.4). A 5-year backtest shows a typical error of ±15%, with 100% of held-out values landing inside the 95% band.

-11%Change by 2029
2.0Projected 2029 index
0.50–3.495% range
±15%Backtest error
19822029
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
20252.00.503.4
20262.00.503.4
20272.00.503.4
20282.00.503.4
20292.00.503.4

Routes In BCR 4

Routes recording Townsend's Warbler in BCR 4.
Chena Hot Spring 2ALASKA592024
HomerALASKA251982
ChickenALASKA52024
Seven LakesALASKA52019
EagleALASKA42024
SlanaALASKA42022
Chena RiverALASKA41988
Anchor RiverALASKA42024
KachemakALASKA32023
DeltaALASKA32024
Chatanika RALASKA22009
Birch LakeALASKA22022
ChistochinaALASKA22024
NorthwayALASKA22023
L SalchaALASKA22023
Kenny LakeALASKA22021
Caribou Mtn.ALASKA22002
Murphy DomeALASKA22023
CircleALASKA12024
LivengoodALASKA12021
Tower BluffsALASKA12023
Skilak LakeALASKA11985
Hatcher PassALASKA12019
Swan Lake RdALASKA12023
Lake LouiseALASKA12010

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