State · BBS 2025 Release · 1966–2024

Washington Breeding Birds

247 species recorded across 114 survey routes, 1968 to 2024. Browse by family or guild below.

Washington Bird Population TrendsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

Black-crowned Night Heron has collapsed in Washington: down 95% on the route-weighted index since 1975.

Eurasian Collared-Dove has surged in Washington: up 31× on the route-weighted index since 2009.

Western Gull has collapsed in Washington: down 94% on the route-weighted index since 1971.

Nashville Warbler has surged in Washington: up 928% on the route-weighted index since 1970.

How Bird Guilds Are Faring in WashingtonGuild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology →

Washington Bird Survey Routes

Browse Washington Birds By FamilyTrendPercent 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 →

Each species links to its trend in Washington.

Osprey Pandionidae

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