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Species · Indiana · BBS 2025 Release · 1966–2024

Louisiana Waterthrush Population Trend in Indiana

All statesForest birds

Louisiana Waterthrush in Indiana has surged: up 144% on the route-weighted index since 1971.

+144%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 →
25Routes 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 →
50YearsYears 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 IndianaNotable 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 Indiana: up 144% on the route-weighted index since 1971.

Louisiana Waterthrush Population Forecast in Indiana

If the recent trend holds, Louisiana Waterthrush in Indiana is projected to rise about 43% by 2029 — from 0.20 in 2024 to a central estimate of 0.29 (95% range 0.14–0.43). A 5-year backtest shows a typical error of ±16.5%, with 100% of held-out values landing inside the 95% band.

+43%Change by 2029TrendPercent 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 →
0.29Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.14–0.4395% 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 →
±16.5%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, Louisiana Waterthrush in Indiana is projected to rise about 43% by 2029 — from 0.20 in 2024 to a central estimate of 0.29 (95% range 0.14–0.43). A 5-year backtest shows a typical error of ±16.5%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20250.270.130.42
20260.280.130.42
20270.280.140.42
20280.280.140.43
20290.290.140.43

Louisiana Waterthrush Survey Routes in Indiana

Routes recording Louisiana Waterthrush in Indiana.
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 →
Corydon220241975
Vevay220181966
Wallace220242000
Witts Station220242024
Hoosier120241990
Indiana Dune120231994
Monticello119861986
Galveston120181985
Brazil119961996
Belmont120221985
Spencer120141977
Azalia120191983
Brookville120231984
Washington120162016
Cumback120011987
Millersburg119961996
Indian Spgs120232009
Celestine120241983
Clear Spring120241981
New Phila120241983
Scottsburg120062006
Evansville120131971
Georgia120242003
Cross Plains120232001
Cyprss120232023

Louisiana Waterthrush Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.