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

Trumpeter Swan In Great Basin

All regionsGreat BasinWaterfowl

Trumpeter Swan in Great Basin has collapsed: down 84% on the route-weighted index since 1974.

-84%Since 1974
10Routes In Region
31Years

Notable Signals

long arc declinecomputed index

Trumpeter Swan has collapsed in Great Basin: down 84% on the route-weighted index since 1974.

Forecast

If the recent trend holds, Trumpeter Swan in Great Basin is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±95.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.00Projected 2029 index
0.00–0.0595% range
±95.4%Backtest error
19722029
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
20250.010.000.05
20260.010.000.05
20270.000.000.05
20280.000.000.05
20290.000.000.05

Routes In Great Basin

Routes recording Trumpeter Swan in Great Basin.
Harney LakeOREGON31993
Blackft ResIDAHO21992
Ruby Valley 2NEVADA22016
Fish LakeOREGON22024
MaldenWASHINGTON22022
Turnbull NwrWASHINGTON22023
BatesIDAHO12018
PrincetonOREGON11973
Malheur NwrOREGON11992
Warner VallyOREGON11995

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