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

Green-winged Teal In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauWaterfowl

Green-winged Teal in Southern Rockies / Colorado Plateau has fallen sharply: down 65% on the route-weighted index since 1970.

-65%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
81Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
53YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Green-winged Teal has fallen sharply in Southern Rockies / Colorado Plateau: down 65% on the route-weighted index since 1970.

Green-winged Teal In Southern Rockies / Colorado Plateau Population Forecast

If the recent trend holds, Green-winged Teal in Southern Rockies / Colorado Plateau is projected to rise about 265% by 2029 — from 0.05 in 2024 to a central estimate of 0.20 (95% range 0.00–0.57). A 5-year backtest shows a typical error of ±345.8%, with 100% of held-out values landing inside the 95% band.

+265%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.20Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.5795% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±345.8%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Green-winged Teal in Southern Rockies / Colorado Plateau is projected to rise about 265% by 2029 — from 0.05 in 2024 to a central estimate of 0.20 (95% range 0.00–0.57). A 5-year backtest shows a typical error of ±345.8%, with 100% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.200.000.57
20260.200.000.57
20270.200.000.57
20280.200.000.57
20290.200.000.57

Routes In Southern Rockies / Colorado Plateau

Routes recording Green-winged Teal in Southern Rockies / Colorado Plateau.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Cortez 2COLORADO122015
Main CanyonUTAH102013
Wellington 2UTAH92011
DinosaurCOLORADO72023
WaldenCOLORADO52017
MoscaCOLORADO51997
Angel FireNEW-MEXICO52002
PasturaNEW-MEXICO51999
M Warner ResUTAH52018
SawmillARIZONA42010
Fish Lake NfUTAH41999
Dunckley PasCOLORADO32011
De BequeCOLORADO32003
Groundhog RsCOLORADO32004
Weston PassCOLORADO32000
AngoraCOLORADO32005
Rifle FallsCOLORADO31999
CrownpointNEW-MEXICO31994
VallecitosNEW-MEXICO32007
VernalUTAH32012
Dry ParkARIZONA22001
Douglas PassCOLORADO22024
DeltaCOLORADO21984
ColonaCOLORADO22005
DoloresCOLORADO21984

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