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

Sedge Wren Population Trend in Wisconsin

All statesGrassland birds

Sedge Wren in Wisconsin has declined: down 40% on the route-weighted index since 1968.

-40%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 →
93Routes 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 Sedge Wren Trends in WisconsinNotable 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 Sedge Wren in Wisconsin. See the full index history below.

Sedge Wren Population Forecast in Wisconsin

If the recent trend holds, Sedge Wren in Wisconsin is projected to rise about 23% by 2030 — from 1.8 in 2025 to a central estimate of 2.3 (95% range 0.57–3.9). A 5-year backtest shows a typical error of ±57.4%, with 100% of held-out values landing inside the 95% band.

+23%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 →
2.3Projected 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 →
0.57–3.995% 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 →
±57.4%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, Sedge Wren in Wisconsin is projected to rise about 23% by 2030 — from 1.8 in 2025 to a central estimate of 2.3 (95% range 0.57–3.9). A 5-year backtest shows a typical error of ±57.4%, 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 →
20262.30.664.0
20272.30.644.0
20282.30.624.0
20292.30.604.0
20302.30.573.9

Sedge Wren Survey Routes in Wisconsin

Routes recording Sedge Wren in Wisconsin.
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 →
Gilman3820251966
Holway1919891967
Stetsonville1720251990
River Falls1220241998
Omro 21120242002
N Andover1019961971
Bayfield820251967
Wis Rapids820231969
Bashaw820251998
Weirgor Springs820251999
Unity620251967
Verona620251994
Amnicon Falls620251998
Flambeau620251998
Mather520231966
Weyerhauser420251966
Newburg Crns420221967
Rolling Pr420151966
Hebron420251966
Chaffey320251966
Cumberland320251966
Gilmanton320091967
Cadott320251968
Manawa320231966
Kendall320251970

Sedge Wren Population Trend in Other States

connecticutdelawareillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanew-hampshirenew-yorknorth-dakotaohiopennsylvaniasouth-dakotavermontvirginia

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