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

Common Merganser In Great Basin

All regionsGreat BasinWaterfowl

Common Merganser in Great Basin has increased: up 42% on the route-weighted index since 1971.

+42%Since 1971
59Routes In Region
54Years

Notable Signals

No notable trend signals for Common Merganser in Great Basin. See the full index history below.

Forecast

If the recent trend holds, Common Merganser in Great Basin is projected to stay roughly flat through 2029, near 0.24 (95% range 0.07–0.41). A 5-year backtest shows a typical error of ±81.1%, with 100% of held-out values landing inside the 95% band.

-3%Change by 2029
0.24Projected 2029 index
0.07–0.4195% range
±81.1%Backtest error
19692029
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
20250.230.060.41
20260.230.060.41
20270.240.070.41
20280.240.070.41
20290.240.070.41

Routes In Great Basin

Routes recording Common Merganser in Great Basin.
Iron GateCALIFORNIA242019
JosephOREGON132024
Dobbin CreekNEVADA102011
RimrockWASHINGTON82023
FallonNEVADA61998
SistersOREGON62016
NighthawkWASHINGTON62024
No CascadesWASHINGTON61996
NewhalemWASHINGTON52024
Iron SpringsIDAHO42019
Dougal ResIDAHO42019
NixonNEVADA42023
BrewsterWASHINGTON42015
LeavenworthWASHINGTON41990
LikelyCALIFORNIA31999
Dell SpringOREGON31982
YakimaWASHINGTON32024
Clear Lk ResCALIFORNIA22004
GiffordIDAHO22017
TriangleIDAHO22024
Magic MtnIDAHO22009
ImnahaOREGON22017
Camp ShermanOREGON21996
AdrianOREGON22008
Bly 2OREGON22011

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