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

Chestnut-sided Warbler In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieForest birds

Chestnut-sided Warbler in Eastern Tallgrass Prairie has edged down: down 16% on the route-weighted index since 1983.

-16%Since 1983TrendPercent 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 →
14Routes 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 →
17YearsYears 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 Chestnut-sided Warbler in Eastern Tallgrass Prairie. See the full index history below.

Routes In Eastern Tallgrass Prairie

Routes recording Chestnut-sided Warbler 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 →
FairdaleILLINOIS22021
RaymondWISCONSIN22019
BarringtonILLINOIS11999
PontiacILLINOIS11992
Lake SummersetILLINOIS12009
ThorntownINDIANA11987
MuncieINDIANA11981
Portage 2INDIANA12015
DinsdaleIOWA11984
WashtaIOWA11983
Rock CreekKANSAS11995
WestervilleOHIO11978
FultonOHIO11983
River FallsWISCONSIN12018

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