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

Clay-colored Sparrow Population Trend in Wyoming

All statesGeneralists

Clay-colored Sparrow in Wyoming has fallen sharply: down 64% on the route-weighted index since 1974.

-64%Since 1974TrendPercent 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 →
46Routes 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 →
48YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Clay-colored Sparrow Trends in WyomingNotable 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 →

Clay-colored Sparrow has fallen sharply in Wyoming: down 64% on the route-weighted index since 1974.

Clay-colored Sparrow Population Forecast in Wyoming

If the recent trend holds, Clay-colored Sparrow in Wyoming is projected to stay roughly flat through 2029, near 0.32 (95% range 0.00–0.79). A 5-year backtest shows a typical error of ±1956.8%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.32Projected 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 →
0.00–0.7995% 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 →
±1956.8%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, Clay-colored Sparrow in Wyoming is projected to stay roughly flat through 2029, near 0.32 (95% range 0.00–0.79). A 5-year backtest shows a typical error of ±1956.8%, 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 →
20250.310.000.79
20260.310.000.79
20270.310.000.79
20280.310.000.79
20290.320.000.79

Clay-colored Sparrow Survey Routes in Wyoming

Routes recording Clay-colored Sparrow in Wyoming.
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 →
Patrick Draw 52420072004
Soda Well1919811981
Harmony1119871987
Bill820011996
Walcott720141990
Pine Tree519951993
Pathfinder520231991
Patrick Draw 6420112011
Piney419901990
Worland419941993
Hampshire420011994
Baggs420042001
Sundance219761976
Dubois220172017
Hunter Peak220101988
Moose219881978
Tensleep220092009
Crazy Woman220152004
Raven220151994
Ne Entrance119951988
Cody120052003
Otto119901990
Wyarno119751974
Colter Bay119941968
Nowood120011996

Clay-colored Sparrow Population Trend in Other States

coloradoillinoisindianaiowamainemichiganminnesotamontananebraskanew-yorknorth-dakotapennsylvaniasouth-dakotautahwashingtonwisconsin

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