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

Song Sparrow Population Trend in Oregon

All statesForest birds

Song Sparrow in Oregon has declined: down 26% on the route-weighted index since 1970.

-26%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 →
136Routes 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 Song 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 Song Sparrow in Oregon. See the full index history below.

Song Sparrow Population Forecast in Oregon

If the recent trend holds, Song Sparrow in Oregon is projected to fall about 20% by 2030 — from 11 in 2025 to a central estimate of 8.4 (95% range 5.8–11). A 5-year backtest shows a typical error of ±11.9%, with 100% of held-out values landing inside the 95% band.

-20%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 →
8.4Projected 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 →
5.8–1195% 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 →
±11.9%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 Oregon is projected to fall about 20% by 2030 — from 11 in 2025 to a central estimate of 8.4 (95% range 5.8–11). A 5-year backtest shows a typical error of ±11.9%, 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 →
20268.76.111
20278.66.011
20288.56.011
20298.55.911
20308.45.811

Song Sparrow Survey Routes in Oregon

Routes recording Song 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 →
Tualatin6020251968
Glasgow5020251986
Scappoose5020251995
Wedderburn4420251970
Sparta4020251971
Salado3820251968
Garfield3820251973
Hazel Camp3720221975
Salem3720251993
Sandy River3720061993
Imnaha3420251968
Hauser3419851970
Bridgeport3320251987
Svensen3319921990
Elkton3220251972
Coquille3120251994
Adair2920251971
Fish Lake2920251972
Lorane2820251993
Fisher2720101997
Donelly 22620252018
Logdell2520251971
Harlan 22520252011
Klickitat Mt2419961993
Umpqua2220251968

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiopennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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