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Species · Oregon · BBS 2026 Release · 1966–2025

Spotted Towhee Population Trend in Oregon

All statesForest birds

Spotted Towhee in Oregon has edged down: down 12% on the route-weighted index since 1970.

-12%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 →
116Routes 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 Spotted Towhee 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 Spotted Towhee in Oregon. See the full index history below.

Spotted Towhee Population Forecast in Oregon

If the recent trend holds, Spotted Towhee in Oregon is projected to fall about 20% by 2030 — from 7.9 in 2025 to a central estimate of 6.3 (95% range 3.8–8.8). A 5-year backtest shows a typical error of ±16.2%, 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 →
6.3Projected 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 →
3.8–8.895% 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 →
±16.2%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, Spotted Towhee in Oregon is projected to fall about 20% by 2030 — from 7.9 in 2025 to a central estimate of 6.3 (95% range 3.8–8.8). A 5-year backtest shows a typical error of ±16.2%, 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 →
20266.23.78.7
20276.23.78.8
20286.33.78.8
20296.33.78.8
20306.33.88.8

Spotted Towhee Survey Routes in Oregon

Routes recording Spotted Towhee 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 →
Garfield7620251973
Umpqua4220251968
Green4220251994
Scappoose4120251995
Elkton3620251972
Wallowa3620252025
Tualatin3120251968
Derby2719931968
Secret Val2720251975
Adair2620251971
Salem2620251993
Dayton2320251973
Selma2220251994
Sandy River2220061993
Emigrant Lk2120011972
Lorane2120251993
Mt Hood2020251972
Ruch1920251992
Scio1820251971
Canby1820251993
Badger Creek1720251992
Hells Canyon1620251992
Monument1620251993
Santiam1620251994
Days Creek1420251970

Spotted Towhee Population Trend in Other States

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