BirdAnalyst
Species · Oregon · BBS 2026 Release · 1966–2025

House Sparrow Population Trend in Oregon

All statesGeneralists

House Sparrow in Oregon has declined: down 45% on the route-weighted index since 1970.

-45%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 StateSurvey 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 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 54% by 2030 — from 6.0 in 2025 to a central estimate of 2.7 (95% range 0.00–6.7). A 5-year backtest shows a typical error of ±59.6%, with 20% of held-out values landing inside the 95% band.

-54%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 →
2.7Projected 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 →
0.00–6.795% 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 →
±59.6%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 54% by 2030 — from 6.0 in 2025 to a central estimate of 2.7 (95% range 0.00–6.7). A 5-year backtest shows a typical error of ±59.6%, with 20% 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 →
20263.20.007.2
20273.10.007.1
20283.00.007.0
20292.90.006.8
20302.70.006.7

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
Umatilla6820251988
Fandango Can5720251985
Ordnance4919791971
Sparta4020251971
Dayton3720251973
Green3320251994
Canby3120251993
Modoc Point2920181969
Crowley2720032003
Modoc Point 22520252024
Cecil2320251998
Salem2320251993
Sams Valley2220251993
Hauser2119851970
Deschutes2020251968
Adair1920251971
Malheur Nwr1920221986
Wedderburn1520251970
Pendleton1520251972
Crane1420241993
Montague1320251974
Winberry1220231968
Garfield1220251973
Hazel Camp1220221975

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 2026-08-14.