BirdAnalyst
Species · California · BBS 2025 Release · 1966–2024

Ridgway's Rail Population Trend in California

All statesWetland birds

Ridgway's Rail in California has declined: down 30% on the route-weighted index since 1978.

-30%Since 1978TrendPercent 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 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 Ridgway's Rail Trends in CaliforniaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Ridgway's Rail in California. See the full index history below.

Ridgway's Rail Survey Routes in California

Routes recording Ridgway's Rail in California.
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 →
Niland120191982
Palo Verde120182018
Poway119731973
Imperial Dam119911977

Ridgway's Rail Population Trend in Other States

arizonanevada

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