BirdAnalyst
Species · Idaho · BBS 2026 Release · 1966–2025

White-faced Ibis Population Trend in Idaho

All statesWetland birds

White-faced Ibis in Idaho has surged: up 607% on the route-weighted index since 1973.

+607%Since 1973TrendPercent 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 →
10Routes 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 →
47YearsYears 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 IdahoNotable 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 Idaho: up 607% on the route-weighted index since 1973.

White-faced Ibis Population Forecast in Idaho

If the recent trend holds, White-faced Ibis in Idaho is projected to fall about 32% by 2030 — from 16 in 2025 to a central estimate of 11 (95% range 0.00–23). A 5-year backtest shows a typical error of ±1888.6%, with 100% of held-out values landing inside the 95% band.

-32%Change by 2030TrendPercent 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 →
11Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–2395% 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 →
±1888.6%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 Idaho is projected to fall about 32% by 2030 — from 16 in 2025 to a central estimate of 11 (95% range 0.00–23). A 5-year backtest shows a typical error of ±1888.6%, with 100% of held-out values landing inside the 95% band.19712030
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 →
2026100.0023
2027100.0023
2028100.0023
2029110.0023
2030110.0023

White-faced Ibis Survey Routes in Idaho

Routes recording White-faced Ibis in Idaho.
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 →
Mud Lake55620251988
Preston3720231988
Cedar Hill2920222002
Pocatello2520191981
Springfield1220141971
Blackft Res720012001
Picabo720212021
Tractor Flat420241991
Ririe320221987
Iron Springs120152015

White-faced Ibis Population Trend in Other States

arizonacaliforniacoloradokansaslouisianamontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwyoming

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