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

Blue-winged Teal In Great Basin

All regionsGreat BasinWaterfowl

Blue-winged Teal in Great Basin has fallen sharply: down 59% on the route-weighted index since 1972.

-59%Since 1972
77Routes In Region
54Years

Notable Signals

long arc declinecomputed index

Blue-winged Teal has fallen sharply in Great Basin: down 59% on the route-weighted index since 1972.

Forecast

If the recent trend holds, Blue-winged Teal in Great Basin is projected to fall about 75% by 2029 — from 0.08 in 2024 to a central estimate of 0.02 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±176.2%, with 100% of held-out values landing inside the 95% band.

-75%Change by 2029
0.02Projected 2029 index
0.00–0.4295% range
±176.2%Backtest error
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 index95% low95% high
20250.050.000.45
20260.040.000.44
20270.030.000.43
20280.030.000.43
20290.020.000.42

Routes In Great Basin

Routes recording Blue-winged Teal in Great Basin.
Moses CouleeWASHINGTON92002
DorrisCALIFORNIA62019
HarwoodWASHINGTON61993
Honey LakeCALIFORNIA52024
Mud LakeIDAHO52021
EllensburgWASHINGTON51987
NighthawkWASHINGTON52019
Iron SpringsIDAHO42021
CallaoUTAH42024
BrewsterWASHINGTON42018
HarringtonWASHINGTON42000
BartleCALIFORNIA31984
LeadoreIDAHO32012
Glenns FerryIDAHO31968
Moses LakeWASHINGTON32010
AsotinWASHINGTON32002
TonasketWASHINGTON32014
EwanWASHINGTON31999
Columbia NwrWASHINGTON32021
BentonCALIFORNIA22023
LikelyCALIFORNIA21989
Davis CreekCALIFORNIA21980
MacdoelCALIFORNIA21999
Iron GateCALIFORNIA22015
DuboisIDAHO21977

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