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

Song Sparrow In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestForest birds

Song Sparrow in Northern Pacific Rainforest has edged down: down 21% on the route-weighted index since 1970.

-21%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 →
150Routes 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 Song Sparrow in Northern Pacific Rainforest. See the full index history below.

Song Sparrow In Northern Pacific Rainforest Population Forecast

If the recent trend holds, Song Sparrow in Northern Pacific Rainforest is projected to fall about 23% by 2030 — from 18 in 2025 to a central estimate of 14 (95% range 10–18). A 5-year backtest shows a typical error of ±21%, with 40% of held-out values landing inside the 95% band.

-23%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 →
14Projected 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 →
10–1895% 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 →
±21%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, Song Sparrow in Northern Pacific Rainforest is projected to fall about 23% by 2030 — from 18 in 2025 to a central estimate of 14 (95% range 10–18). A 5-year backtest shows a typical error of ±21%, with 40% 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 →
2026141118
2027141018
2028141018
2029141018
2030141018

Routes In Northern Pacific Rainforest

Routes recording Song Sparrow 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 →
TualatinOREGON602025
MukilteoWASHINGTON582025
South ElmaWASHINGTON562024
Horse CreekCALIFORNIA542019
Mendota 2WASHINGTON542000
GlasgowOREGON502025
ScappooseOREGON502025
OzetteWASHINGTON492025
MendotaWASHINGTON471988
WedderburnOREGON442025
Warm BeachWASHINGTON442017
Vashon Is.WASHINGTON432025
Mendota 3WASHINGTON422025
EverettWASHINGTON412025
MontesandWASHINGTON412024
Raymond 2WASHINGTON392024
SaladoOREGON382025
GarfieldOREGON382025
Port AngelesWASHINGTON382025
Hazel CampOREGON372022
SalemOREGON372025
Sandy RiverOREGON372006
CarnationWASHINGTON362025
HauserOREGON341985
SvensenOREGON331992

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