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

Western Screech-Owl Population Trend in Oregon

All statesGeneralists

Western Screech-Owl in Oregon has fallen sharply: down 58% on the route-weighted index since 1984.

-58%Since 1984TrendPercent 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 →
23Routes 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 →
18YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Western Screech-Owl 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 Western Screech-Owl in Oregon. See the full index history below.

Western Screech-Owl Population Forecast in Oregon

If the recent trend holds, Western Screech-Owl in Oregon is projected to stay roughly flat through 2028, near 0.01 (95% range 0.00–0.04). A 5-year backtest shows a typical error of ±23.1%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028TrendPercent 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 →
0.01Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0495% 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 →
±23.1%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, Western Screech-Owl in Oregon is projected to stay roughly flat through 2028, near 0.01 (95% range 0.00–0.04). A 5-year backtest shows a typical error of ±23.1%, with 100% of held-out values landing inside the 95% band.19722028
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 →
20240.010.000.04
20250.010.000.04
20260.010.000.04
20270.010.000.04
20280.010.000.04

Western Screech-Owl Survey Routes in Oregon

Routes recording Western Screech-Owl 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 →
Three Forks220162016
Shellrock119981998
Summit Pr120142014
Salado120062006
Scappoose120042004
Lapham Res.119991999
Nicolai Mtn.119991999
Umpqua120031994
Wedderburn119721972
Days Creek119781978
Emigrant Lake 2120032003
Dayton119871987
Pendleton120182018
Silver Creek119841984
Adrian119941984
Trask Summit119931993
Badger Creek119991999
Blue River120122012
Coquille120132013
Ruch120232023
Lorane120222022
Selma120231994
Trout Creek119981998

Western Screech-Owl Population Trend in Other States

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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.