BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Gadwall In Northern Rockies

All regionsNorthern RockiesWaterfowl

Gadwall in Northern Rockies has surged: up 463% on the route-weighted index since 1974.

+463%Since 1974
89Routes In Region
51Years

Notable Signals

long arc increasecomputed index

Gadwall has surged in Northern Rockies: up 463% on the route-weighted index since 1974.

Forecast

If the recent trend holds, Gadwall in Northern Rockies is projected to rise about 317% by 2029 — from 0.24 in 2024 to a central estimate of 1.0 (95% range 0.19–1.8). A 5-year backtest shows a typical error of ±150.7%, with 80% of held-out values landing inside the 95% band.

+317%Change by 2029
1.0Projected 2029 index
0.19–1.895% range
±150.7%Backtest error
19702029
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
20250.950.141.8
20260.960.151.8
20270.980.161.8
20280.990.181.8
20291.00.191.8

Routes In Northern Rockies

Routes recording Gadwall in Northern Rockies.
Rock RiverWYOMING992022
Neponset ResUTAH402017
FeathervilleIDAHO82001
E. Bear LakeUTAH82022
HarmonyWYOMING82022
SeedskadeeWYOMING82016
YellowstoneWYOMING82022
Rawlins 2WYOMING72017
CabartonIDAHO62023
Pablo Res.MONTANA62023
Green RiverWYOMING61984
NaplesIDAHO52024
Red RockMONTANA52022
Saleratus CrUTAH52016
LayCOLORADO42024
BeaverheadMONTANA42023
RandolphUTAH42024
CrowheartWYOMING42004
WalcottWYOMING42021
Carter 2WYOMING42024
Hayden ValWYOMING41986
AugustaMONTANA32022
Willow Creek 2MONTANA32021
Wolf CreekMONTANA32019
BridgeportOREGON32012

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