BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Ring-necked Duck Population Trend in Colorado

All statesWaterfowl

Ring-necked Duck in Colorado has declined: down 47% on the route-weighted index since 1988.

-47%Since 1988TrendPercent 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 →
29Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
35YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ring-necked Duck Trends in ColoradoNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Ring-necked Duck in Colorado. See the full index history below.

Ring-necked Duck Population Forecast in Colorado

If the recent trend holds, Ring-necked Duck in Colorado is projected to stay roughly flat through 2029, near 0.12 (95% range 0.00–0.35). A 5-year backtest shows a typical error of ±209.8%, with 100% of held-out values landing inside the 95% band.

+5%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 →
0.12Projected 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 →
0.00–0.3595% 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 →
±209.8%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, Ring-necked Duck in Colorado is projected to stay roughly flat through 2029, near 0.12 (95% range 0.00–0.35). A 5-year backtest shows a typical error of ±209.8%, with 100% of held-out values landing inside the 95% band.19862029
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 →
20250.120.000.35
20260.120.000.35
20270.120.000.35
20280.120.000.35
20290.120.000.35

Ring-necked Duck Survey Routes in Colorado

Routes recording Ring-necked Duck in Colorado.
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 →
Stillwater Pass1220061998
Willow Peak620101997
Piedra620161992
Yellowjacket Pass620242003
Alamosa419881988
Weston Pass319991997
Gold Hill320052005
Rifle Falls320062006
Aspen220171986
Rio Grnds Rs220242006
Mcphee Res.220241999
Dunckley Pas220172015
Cochetopa Pass220222022
Cortez219891989
Yampa119861986
Kiowa119871987
Colona119961996
Parlin120142014
Cortez 2120162013
Tarryall120142014
Dinosaur120211995
Doyleville120231988
Ragged Mtn.120161998
Powderhorn120041998
Paonia119981998

Ring-necked Duck Population Trend in Other States

alabamaalaskaarizonacaliforniaidahoiowamainemichiganminnesotamontananebraskanevadanew-hampshirenew-yorknorth-dakotaohiooregonsouth-dakotautahvermontwashingtonwisconsinwyoming

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