BirdAnalyst
Species · BCR 5 · BBS 2026 Release · 1966–2025

Warbling Vireo In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestForest birds

Warbling Vireo in Northern Pacific Rainforest has edged up: up 12% on the route-weighted index since 1970.

+12%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
138Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Warbling Vireo in Northern Pacific Rainforest. See the full index history below.

Warbling Vireo In Northern Pacific Rainforest Population Forecast

If the recent trend holds, Warbling Vireo in Northern Pacific Rainforest is projected to stay roughly flat through 2030, near 8.6 (95% range 5.9–11). A 5-year backtest shows a typical error of ±17.5%, with 80% of held-out values landing inside the 95% band.

-2%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
8.6Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
5.9–1195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±17.5%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Warbling Vireo in Northern Pacific Rainforest is projected to stay roughly flat through 2030, near 8.6 (95% range 5.9–11). A 5-year backtest shows a typical error of ±17.5%, with 80% of held-out values landing inside the 95% band.19682030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20268.45.811
20278.55.911
20288.55.911
20298.55.911
20308.65.911

Routes In Northern Pacific Rainforest

Routes recording Warbling Vireo in Northern Pacific Rainforest.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
CougarWASHINGTON882023
MontesandWASHINGTON572024
LoraneOREGON552025
FisherOREGON462010
KamilcheWASHINGTON412025
SaladoOREGON362025
Pe EllWASHINGTON362025
HoneydewCALIFORNIA342017
Klickitat MtOREGON331996
OzetteWASHINGTON302025
TimberOREGON282017
Cedar FallsWASHINGTON272014
Harlan 2OREGON252025
Mendota 3WASHINGTON252025
WaldportOREGON242001
HarlanOREGON232009
MolallaOREGON212025
Raymond 2WASHINGTON212024
Riley PeakOREGON202016
SvensenOREGON191992
SantiamOREGON192025
Fisher 2OREGON182025
HainesALASKA172025
ElktonOREGON172025
Stikine RiverALASKA162024

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.