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

Louisiana Waterthrush Population Trend in South Carolina

All statesForest birds

Louisiana Waterthrush in South Carolina has declined: down 33% on the route-weighted index since 1968.

-33%Since 1968TrendPercent 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 →
28Routes 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 →
44YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Louisiana Waterthrush 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 →

No notable trend signals for Louisiana Waterthrush in South Carolina. See the full index history below.

Louisiana Waterthrush Population Forecast in South Carolina

If the recent trend holds, Louisiana Waterthrush in South Carolina is projected to stay roughly flat through 2030, near 0.08 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±52.4%, with 100% of held-out values landing inside the 95% band.

+10%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 →
0.08Projected 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 →
0.00–0.3695% 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 →
±52.4%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, Louisiana Waterthrush in South Carolina is projected to stay roughly flat through 2030, near 0.08 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±52.4%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.090.000.36
20270.080.000.36
20280.080.000.36
20290.080.000.36
20300.080.000.36

Louisiana Waterthrush Survey Routes in South Carolina

Routes recording Louisiana Waterthrush 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 →
Mount Pisgah220211998
Bennettsville220002000
Rome120122000
Sandhills120222022
Coward119871987
Foreston119781973
New Holland119801967
Wagener119931968
Dillon120002000
Bishopville119851978
Little Mtn119851966
Salem Xrd120191984
Owings119971996
Barton Creek119941994
Boiling Spgs119761976
Plum Branch120221979
Ward120252025
Whitmire120242024
Ridgeway120112010
Salem120192019
Blacksburg119991998
Greenwood120252003
Joanna120022002
Olar120082000
Battlecreek120021999

Louisiana Waterthrush Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandtennesseetexasvermontvirginiawest-virginiawisconsin

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