BirdAnalyst
Species · BCR 22 · BBS 2025 Release · 1966–2024

Sedge Wren In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieGrassland birds

Sedge Wren in Eastern Tallgrass Prairie has declined: down 41% on the route-weighted index since 1969.

-41%Since 1969TrendPercent 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 →
127Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Eastern Tallgrass Prairie. See the full index history below.

Sedge Wren In Eastern Tallgrass Prairie Population Forecast

If the recent trend holds, Sedge Wren in Eastern Tallgrass Prairie is projected to rise about 14% by 2029 — from 0.16 in 2024 to a central estimate of 0.18 (95% range 0.03–0.34). A 5-year backtest shows a typical error of ±74.9%, with 100% of held-out values landing inside the 95% band.

+14%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 →
0.18Projected 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 →
0.03–0.3495% 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 →
±74.9%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 Eastern Tallgrass Prairie is projected to rise about 14% by 2029 — from 0.16 in 2024 to a central estimate of 0.18 (95% range 0.03–0.34). A 5-year backtest shows a typical error of ±74.9%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20250.180.030.34
20260.180.030.34
20270.180.030.34
20280.180.030.34
20290.180.030.34

Routes In Eastern Tallgrass Prairie

Routes recording Sedge Wren in Eastern Tallgrass Prairie.
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 →
MurdockNEBRASKA132021
River FallsWISCONSIN122024
Mascoutah LkILLINOIS82013
Rock ValleyIOWA82019
Davis CornerIOWA72024
BedfordIOWA62018
New LenoxILLINOIS41984
MilfordILLINOIS41997
KeithsburgILLINOIS42007
MiddletownINDIANA41994
BrooklynIOWA42011
AliceIOWA41999
SherburnvillILLINOIS31974
MonticelloILLINOIS32007
MartinsvilleILLINOIS31999
BeaucoupILLINOIS32016
WalesIOWA32018
GazaIOWA32019
College Spgs 2IOWA32010
Ash CreekMINNESOTA32024
GeneseoILLINOIS22000
WayneILLINOIS22023
Bluff SpgsILLINOIS21998
FairlandILLINOIS21985
JamestownILLINOIS22013

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