BirdAnalyst
Species · BCR 18 · BBS 2025 Release · 1966–2024

Gadwall In Shortgrass Prairie

All regionsShortgrass PrairieWaterfowl

Gadwall in Shortgrass Prairie has fallen sharply: down 55% on the route-weighted index since 1970.

-55%Since 1970
43Routes In Region
48Years

Notable Signals

long arc declinecomputed index

Gadwall has fallen sharply in Shortgrass Prairie: down 55% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Gadwall in Shortgrass Prairie is projected to stay roughly flat through 2029, near 0.11 (95% range 0.00–0.32). A 5-year backtest shows a typical error of ±128.6%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.11Projected 2029 index
0.00–0.3295% range
±128.6%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
20250.110.000.33
20260.110.000.33
20270.110.000.32
20280.110.000.32
20290.110.000.32

Routes In Shortgrass Prairie

Routes recording Gadwall in Shortgrass Prairie.
Last ChanceCOLORADO91974
PantexTEXAS82009
NeegrandeCOLORADO72018
GrenvilleNEW-MEXICO61979
Wildhorse LCOLORADO52023
Fort MorganCOLORADO52011
ClovisNEW-MEXICO52013
StonehamCOLORADO42021
HaswellCOLORADO42022
NunnCOLORADO42018
JulesburgCOLORADO42004
Wagon MoundNEW-MEXICO41973
MaxwellNEW-MEXICO42013
HudsonCOLORADO32021
FlemingCOLORADO21985
KiowaCOLORADO22018
BethuneCOLORADO22017
GroverCOLORADO22022
AmherstCOLORADO22018
Prospect ValCOLORADO21999
LimonCOLORADO22016
KarvalCOLORADO22016
Sheridan LakCOLORADO21995
PritchettCOLORADO22010
Arsenal 2COLORADO22022

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