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

White-faced Ibis Population Trend in Oregon

All statesWetland birds

White-faced Ibis in Oregon has surged: up 22× on the route-weighted index since 1979.

22×Since 1979TrendPercent 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 →
13Routes 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 →
43YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable White-faced Ibis Trends in OregonNotable 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 →

White-faced Ibis has surged in Oregon: up 22× on the route-weighted index since 1979.

White-faced Ibis Population Forecast in Oregon

If the recent trend holds, White-faced Ibis in Oregon is projected to stay roughly flat through 2029, near 4.8 (95% range 0.00–11). A 5-year backtest shows a typical error of ±70.7%, with 100% of held-out values landing inside the 95% band.

+1%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 →
4.8Projected 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 →
0.00–1195% 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 →
±70.7%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, White-faced Ibis in Oregon is projected to stay roughly flat through 2029, near 4.8 (95% range 0.00–11). A 5-year backtest shows a typical error of ±70.7%, with 100% of held-out values landing inside the 95% band.19752029
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 →
20254.60.0011
20264.60.0011
20274.70.0011
20284.70.0011
20294.80.0011

White-faced Ibis Survey Routes in Oregon

Routes recording White-faced Ibis in Oregon.
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 →
Warner Vally29420241993
Fish Lake10220241985
Merrill5020221993
Catlow Rim3420242013
Sheaville2520222021
Harney Lake1820061996
Blizzard Gap920241989
Chinchalo220161999
Princeton219851975
Malheur Nwr219981986
Crooked Riv.119961996
Modoc Point120182001
Alvord Lake120162006

White-faced Ibis Population Trend in Other States

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