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

Song Sparrow In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestGeneralists

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 →
149Routes 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 →
56YearsYears 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 21% by 2029 — from 17 in 2024 to a central estimate of 14 (95% range 10–17). A 5-year backtest shows a typical error of ±18%, with 60% of held-out values landing inside the 95% band.

-21%Change by 2029TrendPercent 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 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
10–1795% 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 →
±18%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 21% by 2029 — from 17 in 2024 to a central estimate of 14 (95% range 10–17). A 5-year backtest shows a typical error of ±18%, with 60% of held-out values landing inside the 95% band.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 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 →
2025141018
2026141018
2027141017
2028141017
2029141017

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 →
TualatinOREGON642024
South ElmaWASHINGTON562024
Horse CreekCALIFORNIA542019
Mendota 2WASHINGTON542000
Vashon Is.WASHINGTON512024
MukilteoWASHINGTON492024
SalemOREGON482024
Port AngelesWASHINGTON482024
EverettWASHINGTON472024
MendotaWASHINGTON471988
Mendota 3WASHINGTON462024
ScappooseOREGON452023
Warm BeachWASHINGTON442017
GlasgowOREGON432024
WedderburnOREGON422024
ElktonOREGON422024
MontesandWASHINGTON412024
UmpquaOREGON402024
CoquilleOREGON392024
Raymond 2WASHINGTON392024
Crescent CtyCALIFORNIA372024
AdairOREGON372024
Hazel CampOREGON372022
Sandy RiverOREGON372006
GarfieldOREGON352023

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