BirdAnalyst
Species · BCR 28 · BBS 2026 Release · 1966–2025

Louisiana Waterthrush In Appalachian Mountains

All regionsAppalachian MountainsForest birds

Louisiana Waterthrush in Appalachian Mountains has surged: up 131% on the route-weighted index since 1968.

+131%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 →
341Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 increasecomputed 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 →

Louisiana Waterthrush has surged in Appalachian Mountains: up 131% on the route-weighted index since 1968.

Louisiana Waterthrush In Appalachian Mountains Population Forecast

If the recent trend holds, Louisiana Waterthrush in Appalachian Mountains is projected to stay roughly flat through 2030, near 1.2 (95% range 0.94–1.4). A 5-year backtest shows a typical error of ±17.3%, with 60% of held-out values landing inside the 95% band.

-6%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 →
1.2Projected 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 →
0.94–1.495% 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 →
±17.3%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, Louisiana Waterthrush in Appalachian Mountains is projected to stay roughly flat through 2030, near 1.2 (95% range 0.94–1.4). A 5-year backtest shows a typical error of ±17.3%, with 60% 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 →
20261.10.901.3
20271.10.911.3
20281.10.921.4
20291.10.931.4
20301.20.941.4

Routes In Appalachian Mountains

Routes recording Louisiana Waterthrush in Appalachian Mountains.
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 →
Lost RiverWEST-VIRGINIA122025
Cumberlnd GpKENTUCKY102018
Laurel HillPENNSYLVANIA102025
FontanaNORTH-CAROLINA92025
StollingsWEST-VIRGINIA92021
Willis SprngTENNESSEE82022
Natural BridVIRGINIA82025
GlenwoodVIRGINIA82023
PutnamVIRGINIA72025
Strange CrkWEST-VIRGINIA72025
RioWEST-VIRGINIA71995
JenningsMARYLAND62025
DoverNEW-JERSEY62018
Zaleski S.F.OHIO62025
Valley HeadWEST-VIRGINIA62025
MeadowvilleWEST-VIRGINIA62025
Beattyville 2KENTUCKY52024
Mohican S.F.OHIO52025
RavensburgPENNSYLVANIA51975
Warrens MillPENNSYLVANIA52025
Elk ValleyTENNESSEE52025
Clear CreekWEST-VIRGINIA52025
OlcottWEST-VIRGINIA52023
McdonaldWEST-VIRGINIA52023
Yellow SpgWEST-VIRGINIA52022

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