BirdAnalyst
Species · Maine · BBS 2026 Release · 1966–2025

Wood Thrush Population Trend in Maine

All statesForest birds

Wood Thrush in Maine has collapsed: down 86% on the route-weighted index since 1968.

-86%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 →
74Routes 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 Wood Thrush Trends in MaineNotable 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 declinecomputed 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 →

Wood Thrush has collapsed in Maine: down 86% on the route-weighted index since 1968.

Wood Thrush Population Forecast in Maine

If the recent trend holds, Wood Thrush in Maine is projected to fall about 100% by 2030 — from 0.61 in 2025 to a central estimate of 0.00 (95% range 0.00–7.7). A 5-year backtest shows a typical error of ±355.5%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–7.795% 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 →
±355.5%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, Wood Thrush in Maine is projected to fall about 100% by 2030 — from 0.61 in 2025 to a central estimate of 0.00 (95% range 0.00–7.7). A 5-year backtest shows a typical error of ±355.5%, with 100% 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 →
20260.000.007.7
20270.000.007.7
20280.000.007.7
20290.000.007.7
20300.000.007.7

Wood Thrush Survey Routes in Maine

Routes recording Wood Thrush in Maine.
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 →
Benton1619801971
Northfield1319811976
Ludlow1019981968
Warren819901973
Heron Lake819991983
Otisfield Gr720151971
Manchester719951971
Hudson720091973
Turner620101972
Benedicta419981976
Waite419771977
Priestly Br.420091996
Cape Neddick320241972
Reeds320251990
South Arm320131975
East Troy320211972
Aurora320061975
Greenwood220251966
Freedom220191973
Hermon220091967
Castine220051976
Carrying Pl220251979
Carrabassett220181983
Baxter219841977
Greenville220071972

Wood Thrush Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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