BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Common Merganser In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauWaterfowl

Common Merganser in Southern Rockies / Colorado Plateau has surged: up 235% on the route-weighted index since 1975.

+235%Since 1975
54Routes In Region
47Years

Notable Signals

long arc increasecomputed index

Common Merganser has surged in Southern Rockies / Colorado Plateau: up 234% on the route-weighted index since 1975.

Forecast

If the recent trend holds, Common Merganser in Southern Rockies / Colorado Plateau is projected to rise about 11% by 2029 — from 0.24 in 2024 to a central estimate of 0.27 (95% range 0.07–0.47). A 5-year backtest shows a typical error of ±13.5%, with 100% of held-out values landing inside the 95% band.

+11%Change by 2029
0.27Projected 2029 index
0.07–0.4795% range
±13.5%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
20250.260.060.46
20260.260.060.46
20270.260.060.46
20280.270.070.46
20290.270.070.47

Routes In Southern Rockies / Colorado Plateau

Routes recording Common Merganser in Southern Rockies / Colorado Plateau.
TincupCOLORADO122024
Cochetopa PassCOLORADO92024
WaldenCOLORADO72023
FerronUTAH62021
Rio Grnds RsCOLORADO52024
PaoniaCOLORADO42014
ParlinCOLORADO32023
Dolores RivCOLORADO32018
Groundhog RsCOLORADO32016
Fox CreekCOLORADO32023
South ForkCOLORADO32023
Gold HillCOLORADO32012
JensenUTAH32007
KamasUTAH32015
YampaCOLORADO22018
BufordCOLORADO22024
Lost LakeCOLORADO22023
TarryallCOLORADO22023
GuffeyCOLORADO22018
CortezCOLORADO22007
San LuisCOLORADO22024
Lake City 2COLORADO22023
AnimasCOLORADO21998
AngoraCOLORADO22012
Yellowjacket PassCOLORADO22001

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