BirdAnalyst
Species · New Hampshire · BBS 2025 Release · 1966–2024

Louisiana Waterthrush Population Trend in New Hampshire

All statesForest birds

Louisiana Waterthrush in New Hampshire has surged: up 173% on the route-weighted index since 1968.

+173%Since 1968
18Routes In State
52Years

Notable Louisiana Waterthrush Trends in New Hampshire

long arc increasecomputed index

Louisiana Waterthrush has surged in New Hampshire: up 173% on the route-weighted index since 1968.

Louisiana Waterthrush Population Forecast in New Hampshire

If the recent trend holds, Louisiana Waterthrush in New Hampshire is projected to fall about 42% by 2029 — from 0.41 in 2024 to a central estimate of 0.24 (95% range 0.04–0.43). A 5-year backtest shows a typical error of ±46.2%, with 60% of held-out values landing inside the 95% band.

-42%Change by 2029
0.24Projected 2029 index
0.04–0.4395% range
±46.2%Backtest error
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 index95% low95% high
20250.230.030.42
20260.230.030.43
20270.230.030.43
20280.230.040.43
20290.240.040.43

Louisiana Waterthrush Survey Routes in New Hampshire

Routes recording Louisiana Waterthrush in New Hampshire.
Walpole420231976
Fitzwilliam220241990
Hopkinton220192006
Strafford220211981
Canterbury220241991
Marlow220241967
East Kingston220242001
Peterborough120231967
Brentwood119981991
Dover120181993
Epsom119951976
Concord120191992
Gilmantn I W119921992
Wilmot119751971
Mt Chocorua120191972
Jefferson Hl119771967
Franconia119741966
Glen120241975

Louisiana Waterthrush Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsin

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