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

American Wigeon In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauWaterfowl

American Wigeon in Southern Rockies / Colorado Plateau has fallen sharply: down 55% on the route-weighted index since 1977.

-55%Since 1977
29Routes In Region
44Years

Notable Signals

long arc declinecomputed index

American Wigeon has fallen sharply in Southern Rockies / Colorado Plateau: down 55% on the route-weighted index since 1977.

Forecast

If the recent trend holds, American Wigeon in Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2029, near 0.18 (95% range 0.00–0.50). A 5-year backtest shows a typical error of ±801.3%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.18Projected 2029 index
0.00–0.5095% range
±801.3%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
20250.180.000.50
20260.180.000.50
20270.180.000.50
20280.180.000.50
20290.180.000.50

Routes In Southern Rockies / Colorado Plateau

Routes recording American Wigeon in Southern Rockies / Colorado Plateau.
VernalUTAH142012
WaldenCOLORADO52015
M Warner ResUTAH52022
CortezCOLORADO42006
BrookhurstWYOMING42009
Sybille CynWYOMING32024
GuffeyCOLORADO22018
AlamosaCOLORADO22008
PiedraCOLORADO22014
DinosaurCOLORADO22021
Mcphee Res.COLORADO22004
Yellowjacket PassCOLORADO22023
Cochetopa PassCOLORADO22015
CapulinNEW-MEXICO21993
Skyline DrivUTAH22007
Ant Flat-Ogden CanUTAH22019
Beck 2UTAH22005
BufordWYOMING21998
MoffatCOLORADO11976
Rio Grnds RsCOLORADO12022
TincupCOLORADO12018
Lake City 2COLORADO12022
Stillwater PassCOLORADO12006
DulceNEW-MEXICO12011
Angel Fire 2NEW-MEXICO12017

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