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

House Sparrow In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestGeneralists

House Sparrow in Northern Pacific Rainforest has declined: down 38% on the route-weighted index since 1970.

-38%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 →
83Routes 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 House Sparrow in Northern Pacific Rainforest. See the full index history below.

Forecast

If the recent trend holds, House Sparrow in Northern Pacific Rainforest is projected to stay roughly flat through 2029, near 4.3 (95% range 1.5–7.1). A 5-year backtest shows a typical error of ±10.1%, with 100% of held-out values landing inside the 95% band.

+5%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 →
4.3Projected 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 →
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 →
±10.1%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 stay roughly flat through 2029, near 4.3 (95% range 1.5–7.1). A 5-year backtest shows a typical error of ±10.1%, with 100% 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 →
20254.51.77.3
20264.51.77.3
20274.41.67.2
20284.41.67.2
20294.31.57.1

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 →
CamasWASHINGTON392018
Crescent CtyCALIFORNIA382024
YrekaCALIFORNIA362019
DaytonOREGON302024
SalemOREGON302024
CanbyOREGON262024
Sams ValleyOREGON242024
HauserOREGON211985
GreenOREGON212024
Rio DellCALIFORNIA182012
Bay ViewWASHINGTON182017
Emigrant Lake 2OREGON172024
ScappooseOREGON162023
CarnationWASHINGTON142024
WinberryOREGON122023
Hazel CampOREGON122022
Warm Beach 2WASHINGTON122024
Warm BeachWASHINGTON112017
UmpquaOREGON102024
IssaquahWASHINGTON101987
DeceptionWASHINGTON102018
DerbyOREGON81993
AdairOREGON82024
GarfieldOREGON82023
RaymondWASHINGTON82021

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