BirdAnalyst
Species · Idaho · BBS 2026 Release · 1966–2025

Ruddy Duck Population Trend in Idaho

All statesWaterfowl

Ruddy Duck in Idaho has fallen sharply: down 72% on the route-weighted index since 1971.

-72%Since 1971TrendPercent 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 →
10Routes 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 →
43YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ruddy Duck Trends in IdahoNotable 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 →

Ruddy Duck has fallen sharply in Idaho: down 72% on the route-weighted index since 1971.

Ruddy Duck Population Forecast in Idaho

If the recent trend holds, Ruddy Duck in Idaho is projected to fall about 100% by 2030 — from 0.46 in 2025 to a central estimate of 0.00 (95% range 0.00–0.44). A 5-year backtest shows a typical error of ±137.5%, with 80% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–0.4495% 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 →
±137.5%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, Ruddy Duck in Idaho is projected to fall about 100% by 2030 — from 0.46 in 2025 to a central estimate of 0.00 (95% range 0.00–0.44). A 5-year backtest shows a typical error of ±137.5%, with 80% of held-out values landing inside the 95% band.19692030
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 →
20260.020.000.46
20270.010.000.45
20280.000.000.44
20290.000.000.44
20300.000.000.44

Ruddy Duck Survey Routes in Idaho

Routes recording Ruddy Duck in Idaho.
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 →
Naples1420252005
Iron Springs520241988
Cedar Hill420152004
Blackft Res219931984
Triangle220152004
Glenns Ferry219691969
Magic Mtn220251991
Mud Lake219941994
Preston119891989
Springfield120171969

Ruddy Duck Population Trend in Other States

arizonacaliforniacoloradoillinoisindianaiowakansasmichiganminnesotamontananebraskanevadanew-mexiconew-yorknorth-dakotaohiooklahomaoregonsouth-dakotatexasutahwashingtonwisconsinwyoming

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