BirdAnalyst
Guild · Oregon · BBS 2025 Release · 1966–2024

Wetland Birds In Oregon

All statesOregon

26 species in this guild. As a group they are -25%Guild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology → since 1970.

Guild SignalsNotable 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 wetland birds in Oregon. See the full index history below.

Forecast

If the recent trend holds, Wetland birds in Oregon is projected to rise about 17% by 2029 — from 0.63 in 2024 to a central estimate of 0.73 (95% range 0.00–1.8). A 5-year backtest shows a typical error of ±28%, with 100% of held-out values landing inside the 95% band.

+17%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 →
0.73Projected 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 →
0.00–1.895% 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 →
±28%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, Wetland birds in Oregon is projected to rise about 17% by 2029 — from 0.63 in 2024 to a central estimate of 0.73 (95% range 0.00–1.8). A 5-year backtest shows a typical error of ±28%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.750.001.8
20260.750.001.8
20270.740.001.8
20280.740.001.8
20290.730.001.8

Member Species In Oregon

Wetland birds species in Oregon.
TrendPercent 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 →
Western GullLaridae-98%
Black TernLaridae-95%
Western GrebePodicipedidae-94%
Black-crowned Night HeronArdeidae-87%
Green HeronArdeidae-86%
Double-crested CormorantPhalacrocoracidae-72%
Great EgretArdeidae-67%
Forster's TernLaridae-67%
Snowy EgretArdeidae-67%
American White PelicanPelecanidae-66%
American BitternArdeidae-61%
Ring-billed GullLaridae-45%
Pied-billed GrebePodicipedidae-43%
SoraRallidae-40%
Eared GrebePodicipedidae-39%
Franklin's GullLaridae-30%
Glaucous-winged GullLaridae-17%
Great Blue HeronArdeidae-12%
Caspian TernLaridae-11%
Virginia RailRallidae-8%
Clark's GrebePodicipedidae+38%
Sandhill CraneGruidae+40%
Pelagic CormorantPhalacrocoracidae+108%
California GullLaridae+201%
American CootRallidae+687%
White-faced IbisThreskiornithidae22×

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