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Species · Michigan · BBS 2025 Release · 1966–2024

Wood Thrush Population Trend in Michigan

All statesForest birds

Wood Thrush in Michigan has held roughly steady: down 7% on the route-weighted index since 1968.

-7%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 →
102Routes 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 Wood Thrush Trends in MichiganNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Wood Thrush in Michigan. See the full index history below.

Wood Thrush Population Forecast in Michigan

If the recent trend holds, Wood Thrush in Michigan is projected to rise about 24% by 2029 — from 1.7 in 2024 to a central estimate of 2.1 (95% range 1.1–3.0). A 5-year backtest shows a typical error of ±24.6%, with 100% of held-out values landing inside the 95% band.

+24%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 →
2.1Projected 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 →
1.1–3.095% 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 →
±24.6%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 Michigan is projected to rise about 24% by 2029 — from 1.7 in 2024 to a central estimate of 2.1 (95% range 1.1–3.0). A 5-year backtest shows a typical error of ±24.6%, with 100% 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 →
20252.11.13.0
20262.11.13.0
20272.11.13.0
20282.11.13.0
20292.11.13.0

Wood Thrush Survey Routes in Michigan

Routes recording Wood Thrush in Michigan.
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 →
Barry S.G.A. 22120192013
Barry S.G.A.1320121995
Allegan Wma1220191993
Almena1020151993
Brocky Lake819951995
Hubbard Lake819891973
Isabella720121966
Crystal Fls620241979
Maple Grove620241970
Bear Lake520241967
Scottville520241968
Harrietta520241990
Bergland420221979
Howardsville420241972
Monterey420241978
Remus420241974
Tyre419961967
Hamburg420011981
Betchler Lks420232023
Ontonagon320191967
Gibbs City319821979
Shingleton320241967
Lawrence320241970
Irons319861970
Traverse Cty319921975

Wood Thrush Population Trend in Other States

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

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