BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Western Screech-Owl In Great Basin

All regionsGreat BasinGeneralists

Western Screech-Owl in Great Basin has declined: down 48% on the route-weighted index since 1986.

-48%Since 1986TrendPercent 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 →
18Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
19YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Great Basin. See the full index history below.

Western Screech-Owl In Great Basin Population Forecast

If the recent trend holds, Western Screech-Owl in Great Basin is projected to stay roughly flat through 2023, near 0.01 (95% range 0.00–0.02). A 5-year backtest shows a typical error of ±27%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2023TrendPercent 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 2023 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0295% 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 →
±27%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 Great Basin is projected to stay roughly flat through 2023, near 0.01 (95% range 0.00–0.02). A 5-year backtest shows a typical error of ±27%, with 100% of held-out values landing inside the 95% band.19762023
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 →
20190.010.000.02
20200.010.000.02
20210.010.000.02
20220.010.000.02
20230.010.000.02

Routes In Great Basin

Routes recording Western Screech-Owl in Great Basin.
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 →
Magic MtnIDAHO31992
Three ForksOREGON22016
TwispWASHINGTON22008
NubieberCALIFORNIA11986
MacdoelCALIFORNIA11976
Clear Lk ResCALIFORNIA11997
EurekaNEVADA12011
Chimney Res.NEVADA12015
PendletonOREGON12018
AdrianOREGON11994
Lapham Res.OREGON11999
Badger CreekOREGON11999
Trout CreekOREGON11998
LynnUTAH11995
SnowdenWASHINGTON11990
WinthropWASHINGTON11999
RonaldWASHINGTON12010
LeavenworthWASHINGTON12011

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