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Species · West Virginia · BBS 2025 Release · 1966–2024

Blue-headed Vireo Population Trend in West Virginia

All statesForest birds

Blue-headed Vireo in West Virginia has surged: up 23× on the route-weighted index since 1971.

23×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 →
48Routes 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 →
53YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Blue-headed Vireo Trends in West VirginiaNotable 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 increasecomputed 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 →

Blue-headed Vireo has surged in West Virginia: up 23× on the route-weighted index since 1971.

Blue-headed Vireo Population Forecast in West Virginia

If the recent trend holds, Blue-headed Vireo in West Virginia is projected to stay roughly flat through 2029, near 3.4 (95% range 1.7–5.0). A 5-year backtest shows a typical error of ±17.6%, with 100% of held-out values landing inside the 95% band.

+6%Change by 2029TrendPercent 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 →
3.4Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.7–5.095% 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 →
±17.6%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, Blue-headed Vireo in West Virginia is projected to stay roughly flat through 2029, near 3.4 (95% range 1.7–5.0). A 5-year backtest shows a typical error of ±17.6%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20253.11.54.8
20263.21.64.8
20273.31.64.9
20283.31.74.9
20293.41.75.0

Blue-headed Vireo Survey Routes in West Virginia

Routes recording Blue-headed Vireo in West Virginia.
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 →
Bemis1920242001
Glade Run1720021988
Glady1720242002
Washburn1320082007
Glade Run 21320242003
Denmar920241990
Dailey920241975
Josephs Mill720031993
Stollings620211995
Ghent620241979
Bismark620211996
Strange Crk620241993
Green Bank620241977
Wymer520151995
Pedro420241994
Three Forks420241974
Richwood420241980
Sleepy Creek419821967
Hanover320221998
Bowden320241993
Olcott320241979
Ruthbelle320242007
Lost River320212008
Hix220241985
Clear Creek220241997

Blue-headed Vireo Population Trend in Other States

alabamaconnecticutgeorgiakentuckymainemarylandmassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiopennsylvaniarhode-islandsouth-carolinatennesseevermontvirginiawisconsin

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