BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

White-faced Ibis In Great Basin

All regionsGreat BasinWetland birds

White-faced Ibis in Great Basin has surged: up 77× on the route-weighted index since 1973.

77×Since 1973
61Routes In Region
50Years

Notable Signals

long arc increasecomputed index

White-faced Ibis has surged in Great Basin: up 77× on the route-weighted index since 1973.

Forecast

If the recent trend holds, White-faced Ibis in Great Basin is projected to rise about 128% by 2029 — from 8.9 in 2024 to a central estimate of 20 (95% range 4.9–36). A 5-year backtest shows a typical error of ±133.6%, with 80% of held-out values landing inside the 95% band.

+128%Change by 2029
20Projected 2029 index
4.9–3695% range
±133.6%Backtest error
19712029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
2025193.835
2026194.035
2027204.335
2028204.635
2029204.936

Routes In Great Basin

Routes recording White-faced Ibis in Great Basin.
Bear RiverUTAH27882023
PromontoryUTAH3552024
DorrisCALIFORNIA3392019
Ruby Valley 2NEVADA3252024
Warner VallyOREGON2942024
FallonNEVADA1312023
LikelyCALIFORNIA1222024
HikoNEVADA1052021
Fish LakeOREGON1022024
MerrillOREGON502022
FairfieldUTAH461988
PrestonIDAHO372023
Catlow RimOREGON342024
Cedar HillIDAHO292022
PocatelloIDAHO252019
SheavilleOREGON252022
CortezNEVADA242022
Carson RiverNEVADA242002
Ruby ValleyNEVADA202001
Harney LakeOREGON182006
IngallsCALIFORNIA172001
Chimney Res.NEVADA162017
Oak CityUTAH162016
MadelineCALIFORNIA152014
NubieberCALIFORNIA122015

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