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

Henslow's Sparrow Population Trend in West Virginia

All statesGrassland birds

Henslow's Sparrow in West Virginia has collapsed: down 88% on the route-weighted index since 1972.

-88%Since 1972TrendPercent 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 →
9Routes 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 →
12YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Henslow's Sparrow 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 →

Henslow's Sparrow has collapsed in West Virginia: down 88% on the route-weighted index since 1972.

Henslow's Sparrow Survey Routes in West Virginia

Routes recording Henslow's Sparrow 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 →
Bebee319751972
Pedro120081995
Sleepy Creek119741966
Martinsburg119731967
Ruthbelle120132013
Canaan120062006
Valley Head119661966
Shanghai120002000
Green Bank120182018

Henslow's Sparrow Population Trend in Other States

delawareillinoisindianaiowakansaskentuckymarylandmichiganminnesotamissourinebraskanew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-dakotavermontvirginiawisconsin

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