BirdAnalyst
Species · BCR 19 · BBS 2025 Release · 1966–2024

Gadwall In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieWaterfowl

Gadwall in Central Mixed Grass Prairie has collapsed: down 79% on the route-weighted index since 1969.

-79%Since 1969
17Routes In Region
52Years

Notable Signals

long arc declinecomputed index

Gadwall has collapsed in Central Mixed Grass Prairie: down 79% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Gadwall in Central Mixed Grass Prairie is projected to fall about 93% by 2029 — from 0.12 in 2024 to a central estimate of 0.01 (95% range 0.00–0.26). A 5-year backtest shows a typical error of ±116.8%, with 100% of held-out values landing inside the 95% band.

-93%Change by 2029
0.01Projected 2029 index
0.00–0.2695% range
±116.8%Backtest error
19672029
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
20250.020.000.28
20260.020.000.27
20270.020.000.27
20280.010.000.27
20290.010.000.26

Routes In Central Mixed Grass Prairie

Routes recording Gadwall in Central Mixed Grass Prairie.
St JohnKANSAS61969
Piester LakeNEBRASKA62016
AlbertKANSAS41987
KennedyNEBRASKA42024
ArthurNEBRASKA42024
Crescent LkNEBRASKA42016
Swan LakeNEBRASKA32021
LeovilleKANSAS21977
LoganKANSAS21977
RinggoldNEBRASKA22005
Wheeler CoNEBRASKA22022
NenzelNEBRASKA22021
WeinertTEXAS21993
MisslerKANSAS12005
TableNEBRASKA12017
GordonNEBRASKA12013
BrownleeNEBRASKA12018

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