BirdAnalyst
Species · Oregon · BBS 2025 Release · 1966–2024

House Sparrow Population Trend in Oregon

All statesGeneralists

House Sparrow in Oregon has declined: down 43% on the route-weighted index since 1970.

-43%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 →
82Routes In StateSurvey 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 House Sparrow Trends in OregonNotable 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 Oregon. See the full index history below.

House Sparrow Population Forecast in Oregon

If the recent trend holds, House Sparrow in Oregon is projected to fall about 45% by 2029 — from 4.8 in 2024 to a central estimate of 2.6 (95% range 0.00–6.6). A 5-year backtest shows a typical error of ±58%, with 40% of held-out values landing inside the 95% band.

-45%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 →
2.6Projected 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 →
0.00–6.695% 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 →
±58%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 Oregon is projected to fall about 45% by 2029 — from 4.8 in 2024 to a central estimate of 2.6 (95% range 0.00–6.6). A 5-year backtest shows a typical error of ±58%, with 40% 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 →
20253.20.007.1
20263.00.007.0
20272.90.006.9
20282.80.006.7
20292.60.006.6

House Sparrow Survey Routes in Oregon

Routes recording House Sparrow in Oregon.
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 →
Merrill16320221993
Umatilla15320231988
Ordnance4919791971
Cecil4020241998
Deschutes3820241968
Fandango Can3420241985
Dayton3020241973
Green Mtn.3020241994
Salem3020241993
Modoc Point2920181969
Crowley2720032003
Canby2620241993
Sams Valley2420241993
Hauser2119851970
Green2120241994
Modoc Point 22020242024
Adrian1920211984
Malheur Nwr1920221986
Emigrant Lake 21720242002
Scappoose1620231995
Mikkalo1520231996
Joseph1420241971
Sparta1420011971
Crane1420241993
Winberry1220231968

House Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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