BirdAnalyst
Species · West Virginia · BBS 2026 Release · 1966–2025

Common Grackle Population Trend in West Virginia

All statesGeneralists

Common Grackle in West Virginia has collapsed: down 92% on the route-weighted index since 1968.

-92%Since 1968TrendPercent 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 →
62Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Grackle 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 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 →

Common Grackle has collapsed in West Virginia: down 92% on the route-weighted index since 1968.

Common Grackle Population Forecast in West Virginia

If the recent trend holds, Common Grackle in West Virginia is projected to fall about 100% by 2030 — from 7.5 in 2025 to a central estimate of 0.00 (95% range 0.00–43). A 5-year backtest shows a typical error of ±263.5%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–4395% 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 →
±263.5%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, Common Grackle in West Virginia is projected to fall about 100% by 2030 — from 7.5 in 2025 to a central estimate of 0.00 (95% range 0.00–43). A 5-year backtest shows a typical error of ±263.5%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.000.0043
20270.000.0043
20280.000.0043
20290.000.0043
20300.000.0043

Common Grackle Survey Routes in West Virginia

Routes recording Common Grackle 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 →
Arlee32119791966
Sleepy Creek6819901966
Mt Storm5419751966
Pt Pleasant4820251973
Mo Of Seneca3920251969
Martinsburg3020251966
Sugar Grove2420251966
Greer1820231966
Albright1819741966
Ruthbelle1820251975
Slate1720251980
Rockport1420251966
Welch1320251980
Spencer1220241986
Paradise1120251966
Hix1020251970
Moundsville1020251972
Rio1019951974
Ghent920251978
Clendenin820251979
Three Forks820251971
Monongah820191966
Josephs Mill820241993
Ringgold820252025
Fayetteville719901980

Common Grackle Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawisconsinwyoming

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