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

Northern Waterthrush Population Trend in Maine

All statesForest birds

Northern Waterthrush in Maine has fallen sharply: down 64% on the route-weighted index since 1968.

-64%Since 1968
72Routes In State
58Years

Notable Northern Waterthrush Trends in Maine

long arc declinecomputed index

Northern Waterthrush has fallen sharply in Maine: down 64% on the route-weighted index since 1968.

Northern Waterthrush Population Forecast in Maine

If the recent trend holds, Northern Waterthrush in Maine is projected to rise about 109% by 2029 — from 0.42 in 2024 to a central estimate of 0.88 (95% range 0.11–1.6). A 5-year backtest shows a typical error of ±85.9%, with 100% of held-out values landing inside the 95% band.

+109%Change by 2029
0.88Projected 2029 index
0.11–1.695% range
±85.9%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
20250.930.161.7
20260.920.151.7
20270.900.141.7
20280.890.131.7
20290.880.111.6

Northern Waterthrush Survey Routes in Maine

Routes recording Northern Waterthrush in Maine.
St David720051982
Washburn620051979
Pillsbury Pd519681968
Deblois419871987
Telos420061995
Big Twenty 2420092009
Heron Lake420031983
Andover320212010
East Troy320171976
Medway320181976
Clayton Lake320081977
Ludlow319981968
Horse Mtn320111983
Big Twenty320081995
Weeks Brook320161995
Yankeetuladi320091994
Northfield 2220211992
Wilson Mills220241987
Greenwood220192019
Warren219901973
Harmony220241967
Brooks220141977
Hermon220191967
Northfield219811976
Moose River220081983

Northern Waterthrush Population Trend in Other States

alaskaconnecticutidahomarylandmassachusettsmichiganminnesotamontananew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiopennsylvaniarhode-islandvermontvirginiawashingtonwest-virginiawisconsinwyoming

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