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Species · Oregon · BBS 2026 Release · 1966–2025

Oak Titmouse Population Trend in Oregon

All statesForest birds

Oak Titmouse in Oregon has collapsed: down 78% on the route-weighted index since 1971.

-78%Since 1971TrendPercent 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 →
10Routes 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 →
46YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Oak Titmouse 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Oak Titmouse has collapsed in Oregon: down 78% on the route-weighted index since 1971.

Oak Titmouse Population Forecast in Oregon

If the recent trend holds, Oak Titmouse in Oregon is projected to fall about 27% by 2030 — from 0.06 in 2025 to a central estimate of 0.04 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±93.5%, with 100% of held-out values landing inside the 95% band.

-27%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 →
0.04Projected 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 →
0.00–0.1995% 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 →
±93.5%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, Oak Titmouse in Oregon is projected to fall about 27% by 2030 — from 0.06 in 2025 to a central estimate of 0.04 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±93.5%, 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 →
20260.050.000.19
20270.050.000.19
20280.050.000.19
20290.040.000.19
20300.040.000.19

Oak Titmouse Survey Routes in Oregon

Routes recording Oak Titmouse 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 →
Derby619931968
Emigrant Lake 2520252002
Days Creek220141993
Emigrant Lk220011972
Ruch120022002
Secret Val120251981
Merrill119961996
Selma119951995
Prospect120141996
Sams Valley120241993

Oak Titmouse Population Trend in Other States

california

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