BirdAnalyst
Species · South Carolina · BBS 2026 Release · 1966–2025

Wood Duck Population Trend in South Carolina

All statesWaterfowl

Wood Duck in South Carolina has fallen sharply: down 59% on the route-weighted index since 1970.

-59%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 →
35Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Wood Duck Trends in South CarolinaNotable 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 →

Wood Duck has fallen sharply in South Carolina: down 59% on the route-weighted index since 1970.

Wood Duck Population Forecast in South Carolina

If the recent trend holds, Wood Duck in South Carolina is projected to fall about 26% by 2030 — from 0.25 in 2025 to a central estimate of 0.18 (95% range 0.00–0.70). A 5-year backtest shows a typical error of ±91.7%, with 100% of held-out values landing inside the 95% band.

-26%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 →
0.18Projected 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 →
0.00–0.7095% 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 →
±91.7%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, Wood Duck in South Carolina is projected to fall about 26% by 2030 — from 0.25 in 2025 to a central estimate of 0.18 (95% range 0.00–0.70). A 5-year backtest shows a typical error of ±91.7%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20260.210.000.72
20270.210.000.72
20280.200.000.71
20290.190.000.70
20300.180.000.70

Wood Duck Survey Routes in South Carolina

Routes recording Wood Duck in South Carolina.
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 →
Bennettsville420171998
Jamestown319971970
Barton Creek320221974
Johns Isle219671967
Hardeeville220161972
Holly Hill220251973
Foreston220081974
New Holland219941968
Boykin Ml Pd219671967
Walterboro220061973
Salem Xrd219971989
Owings220042004
New Ellenton220102010
Sandhills220251996
Pinewood219991998
Owings 2220252023
Chesnee219991999
Red Bluff220062006
Rome120251989
Coward120121973
Wagener120091968
Dillon120211970
Bishopville119991992
Green Sea120242010
Salem120232014

Wood Duck Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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