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Species · Wyoming · BBS 2026 Release · 1966–2025

American Dipper Population Trend in Wyoming

All statesWetland birds

American Dipper in Wyoming has declined: down 45% on the route-weighted index since 1980.

-45%Since 1980TrendPercent 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 →
12Routes 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 →
42YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Dipper 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 →

No notable trend signals for American Dipper in Wyoming. See the full index history below.

American Dipper Population Forecast in Wyoming

If the recent trend holds, American Dipper in Wyoming is projected to fall about 66% by 2030 — from 0.07 in 2025 to a central estimate of 0.03 (95% range 0.00–0.07). A 5-year backtest shows a typical error of ±59.3%, with 80% of held-out values landing inside the 95% band.

-66%Change by 2030TrendPercent 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 →
0.03Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0795% 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 →
±59.3%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, American Dipper in Wyoming is projected to fall about 66% by 2030 — from 0.07 in 2025 to a central estimate of 0.03 (95% range 0.00–0.07). A 5-year backtest shows a typical error of ±59.3%, with 80% of held-out values landing inside the 95% band.19762030
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 →
20260.030.000.07
20270.030.000.07
20280.030.000.07
20290.030.000.07
20300.030.000.07

American Dipper Survey Routes in Wyoming

Routes recording American Dipper 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 →
Buckskin Mtn420251981
Yellowstone220121988
Wilson220251979
Mammoth220231983
Ne Entrance120151993
Moose120191976
Soda Lake119801980
Bald Mtn120232022
Fox Park120012001
Alpine120251980
Horse Creek120051996
Green River119811979

American Dipper Population Trend in Other States

alaskacaliforniacoloradoidahomontananevadanew-mexicooregonsouth-dakotautahwashington

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.