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

Song Sparrow Population Trend in Oregon

All statesGeneralists

Song Sparrow in Oregon has declined: down 28% on the route-weighted index since 1970.

-28%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 →
134Routes 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 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 stay roughly flat through 2029, near 8.3 (95% range 5.8–11). A 5-year backtest shows a typical error of ±9.2%, with 100% of held-out values landing inside the 95% band.

-9%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 →
8.3Projected 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 →
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 →
±9.2%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 stay roughly flat through 2029, near 8.3 (95% range 5.8–11). A 5-year backtest shows a typical error of ±9.2%, 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 →
20258.66.111
20268.56.011
20278.55.911
20288.45.911
20298.35.811

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 →
Tualatin6420241968
Salem4820241993
Scappoose4520231995
Glasgow4320241986
Wedderburn4220241970
Elkton4220241972
Umpqua4020241968
Fish Lake4020241972
Coquille3920241994
Adair3720241971
Hazel Camp3720221975
Sandy River3720061993
Garfield3520231973
Hauser3419851970
Svensen3319921990
Imnaha3020241968
Salado2920241968
Fisher2720101997
Harlan 22720242011
Lorane2520241993
Klickitat Mt2419961993
Silver Creek2320241984
Donelly 22220242018
Nicolai Mtn.2120241993
Hells Canyon2120221992

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 2026-05-22.