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Species · Idaho · BBS 2025 Release · 1966–2024

Plumbeous Vireo Population Trend in Idaho

All statesForest birds

Plumbeous Vireo in Idaho has collapsed: down 88% on the route-weighted index since 1978.

-88%Since 1978TrendPercent 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 →
15Routes 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 →
34YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Plumbeous Vireo Trends in IdahoNotable 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 →

Plumbeous Vireo has collapsed in Idaho: down 88% on the route-weighted index since 1978.

Plumbeous Vireo Population Forecast in Idaho

If the recent trend holds, Plumbeous Vireo in Idaho is projected to fall about 100% by 2020 — from 0.06 in 2015 to a central estimate of 0.00 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±188.1%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2020TrendPercent 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 →
0.00Projected 2020 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.4295% 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 →
±188.1%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, Plumbeous Vireo in Idaho is projected to fall about 100% by 2020 — from 0.06 in 2015 to a central estimate of 0.00 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±188.1%, with 100% of held-out values landing inside the 95% band.19722020
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 →
20160.000.000.42
20170.000.000.42
20180.000.000.42
20190.000.000.42
20200.000.000.42

Plumbeous Vireo Survey Routes in Idaho

Routes recording Plumbeous Vireo in Idaho.
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 →
Leadore719821982
Silver City319931993
Cascade319831983
Sunbeam319941994
Featherville319981989
Almo219941988
Cabarton219951985
Centerville220151972
Preston119911991
Cape Horn119981998
Squirrel120001994
Yellow Pine119941991
Springfield119801978
Magic Mtn120151987
Pocatello119871987

Plumbeous Vireo Population Trend in Other States

arizonacaliforniacoloradomontananebraskanevadanew-mexicosouth-dakotatexasutahwyoming

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