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Species · Alabama · BBS 2026 Release · 1966–2025

Louisiana Waterthrush Population Trend in Alabama

All statesForest birds

Louisiana Waterthrush in Alabama has surged: up 185% on the route-weighted index since 1968.

+185%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 →
78Routes 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 →
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 Louisiana Waterthrush Trends in AlabamaNotable 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 Alabama: up 185% on the route-weighted index since 1968.

Louisiana Waterthrush Population Forecast in Alabama

If the recent trend holds, Louisiana Waterthrush in Alabama is projected to fall about 16% by 2030 — from 0.37 in 2025 to a central estimate of 0.31 (95% range 0.16–0.47). A 5-year backtest shows a typical error of ±28.4%, with 80% of held-out values landing inside the 95% band.

-16%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 →
0.31Projected 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 →
0.16–0.4795% 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 →
±28.4%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 Alabama is projected to fall about 16% by 2030 — from 0.37 in 2025 to a central estimate of 0.31 (95% range 0.16–0.47). A 5-year backtest shows a typical error of ±28.4%, with 80% 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 →
20260.310.150.46
20270.310.150.46
20280.310.160.47
20290.310.160.47
20300.310.160.47

Louisiana Waterthrush Survey Routes in Alabama

Routes recording Louisiana Waterthrush in Alabama.
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 →
Escatawpa519881988
Billingsley420251967
Dawson319901966
Oneonta320222004
Eufaula320212017
St Florian219931988
Millerville220251973
Greensboro220221970
Sprague220251970
Cottonton220251980
South220081967
Millry220001975
Guntersville220051989
Jena220231981
Wedgeworth220181984
Woodville219951995
Brooksville220252014
Lakeview220252007
Liberty City 2220242017
Vernon220212007
Gastonburg220211998
Hillsboro119881971
Trade120241971
Valhermoso Spgs119731973
Swaim120251972

Louisiana Waterthrush Population Trend in Other States

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

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