BirdAnalyst
Species · Alabama · BBS 2025 Release · 1966–2024

Louisiana Waterthrush Population Trend in Alabama

All statesForest birds

Louisiana Waterthrush in Alabama has surged: up 189% on the route-weighted index since 1968.

+189%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 →
58YearsYears 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 189% 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 stay roughly flat through 2029, near 0.31 (95% range 0.15–0.46). A 5-year backtest shows a typical error of ±24.9%, with 80% of held-out values landing inside the 95% band.

-3%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 →
0.31Projected 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 →
0.15–0.4695% 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 →
±24.9%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 stay roughly flat through 2029, near 0.31 (95% range 0.15–0.46). A 5-year backtest shows a typical error of ±24.9%, with 80% 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 →
20250.300.150.46
20260.300.150.46
20270.300.150.46
20280.310.150.46
20290.310.150.46

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
Dawson319901966
Millerville320241973
Oneonta320222004
Eufaula320212017
St Florian219931988
Greensboro220221970
Billingsley220151967
Cottonton220241980
South220081967
Millry220001975
Guntersville220051989
Jena220231981
Wedgeworth220181984
Elkmont220241993
Woodville219951995
Liberty City 2220242017
Nixburg 2220232018
Vernon220212007
Gastonburg220211998
Hillsboro119881971
Trade120241971
Valhermoso Spgs119731973
Swaim120241972
Pine Grove120231993

Louisiana Waterthrush Population Trend in Other States

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

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