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

Common Grackle Population Trend in West Virginia

All statesGeneralists

Common Grackle in West Virginia has collapsed: down 91% on the route-weighted index since 1968.

-91%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 →
61Routes 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 →
58YearsYears 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 91% 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 2029 — from 7.6 in 2024 to a central estimate of 0.00 (95% range 0.00–44). A 5-year backtest shows a typical error of ±245.7%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–4495% 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 →
±245.7%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 2029 — from 7.6 in 2024 to a central estimate of 0.00 (95% range 0.00–44). A 5-year backtest shows a typical error of ±245.7%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20250.000.0044
20260.000.0044
20270.000.0044
20280.000.0044
20290.000.0044

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
Paradise11520231966
Sleepy Creek6819901966
Mt Storm5419751966
Martinsburg4220241966
Ruthbelle2820241975
Clinton2620241966
Welch2520231980
Spencer2220231986
Slate1920241980
Greer1820231966
Albright1819741966
Hix1720241970
Sugar Grove1720241966
Mo Of Seneca1520241969
Pedro1320231979
Pt Pleasant1320231973
Smoot1220231980
Clear Creek1220241988
Moundsville1220241972
Denmar1120241980
Rockport1120241966
Rio1019951974
Washburn920221974
Monongah820191966

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 2026-05-22.