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

House Sparrow In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestGeneralists

House Sparrow in Northern Pacific Rainforest has declined: down 34% on the route-weighted index since 1970.

-34%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 →
84Routes 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 House Sparrow in Northern Pacific Rainforest. See the full index history below.

House Sparrow In Northern Pacific Rainforest Population Forecast

If the recent trend holds, House Sparrow in Northern Pacific Rainforest is projected to fall about 21% by 2030 — from 5.5 in 2025 to a central estimate of 4.3 (95% range 1.5–7.1). A 5-year backtest shows a typical error of ±12.8%, with 100% of held-out values landing inside the 95% band.

-21%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 →
4.3Projected 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 →
1.5–7.195% 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 →
±12.8%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, House Sparrow in Northern Pacific Rainforest is projected to fall about 21% by 2030 — from 5.5 in 2025 to a central estimate of 4.3 (95% range 1.5–7.1). A 5-year backtest shows a typical error of ±12.8%, with 100% 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 →
20264.51.77.3
20274.51.77.3
20284.41.67.2
20294.41.67.2
20304.31.57.1

Routes In Northern Pacific Rainforest

Routes recording House 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 →
Crescent CtyCALIFORNIA572025
CamasWASHINGTON392018
DaytonOREGON372025
YrekaCALIFORNIA362019
GreenOREGON332025
CanbyOREGON312025
SalemOREGON232025
Sams ValleyOREGON222025
HauserOREGON211985
CarnationWASHINGTON202025
AdairOREGON192025
Rio DellCALIFORNIA182012
Bay ViewWASHINGTON182017
MukilteoWASHINGTON172025
WedderburnOREGON152025
WinberryOREGON122023
GarfieldOREGON122025
Hazel CampOREGON122022
Warm Beach 2WASHINGTON122024
Warm BeachWASHINGTON112017
UmpquaOREGON102025
IssaquahWASHINGTON101987
DeceptionWASHINGTON102018
Emigrant Lake 2OREGON92025
DerbyOREGON81993

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