BirdAnalyst
Species · BCR 37 · BBS 2026 Release · 1966–2025

Black Rail In Gulf Coastal Prairie

All regionsGulf Coastal PrairieWetland birds

Black Rail in Gulf Coastal Prairie has surged: up 85% on the route-weighted index since 1997.

+85%Since 1997TrendPercent 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 →
4Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
16YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 →

Black Rail has surged in Gulf Coastal Prairie: up 85% on the route-weighted index since 1997.

Routes In Gulf Coastal Prairie

Routes recording Black Rail in Gulf Coastal Prairie.
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 →
ChinquapinTEXAS42025
IndianolaTEXAS12006
Oyster LakeTEXAS11997
L. Atascosa NwrTEXAS12022

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