BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

White-faced Ibis In Northern Rockies

All regionsNorthern RockiesWetland birds

White-faced Ibis in Northern Rockies has risen sharply: up 67% on the route-weighted index since 1992.

+67%Since 1992TrendPercent 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 →
11Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
25YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 risen sharply in Northern Rockies: up 67% on the route-weighted index since 1992.

White-faced Ibis In Northern Rockies Population Forecast

If the recent trend holds, White-faced Ibis in Northern Rockies is projected to stay roughly flat through 2029, near 0.30 (95% range 0.00–0.69). A 5-year backtest shows a typical error of ±1238.4%, with 80% of held-out values landing inside the 95% band.

n/aChange 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 →
0.30Projected 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 →
0.00–0.6995% 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 →
±1238.4%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 Northern Rockies is projected to stay roughly flat through 2029, near 0.30 (95% range 0.00–0.69). A 5-year backtest shows a typical error of ±1238.4%, with 80% of held-out values landing inside the 95% band.19832029
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 →
20250.290.000.67
20260.290.000.68
20270.290.000.68
20280.300.000.69
20290.300.000.69

Routes In Northern Rockies

Routes recording White-faced Ibis in Northern Rockies.
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 →
Neponset ResUTAH372018
Red RockMONTANA262022
RandolphUTAH122022
Crawford MtsUTAH72017
Carter 2WYOMING72021
SeedskadeeWYOMING31994
LayCOLORADO22001
FontenelleWYOMING22007
BeaverheadMONTANA12024
TensleepWYOMING12009
HarmonyWYOMING12021

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