BirdAnalyst
Species · BCR 13 · BBS 2025 Release · 1966–2024

Chimney Swift In Lower Great Lakes / St. Lawrence Plain

All regionsLower Great Lakes / St. Lawrence PlainAerial insectivores

Chimney Swift in Lower Great Lakes / St. Lawrence Plain has declined: down 45% on the route-weighted index since 1968.

-45%Since 1968
83Routes In Region
58Years

Notable Signals

No notable trend signals for Chimney Swift in Lower Great Lakes / St. Lawrence Plain. See the full index history below.

Forecast

If the recent trend holds, Chimney Swift in Lower Great Lakes / St. Lawrence Plain is projected to rise about 79% by 2029 — from 3.3 in 2024 to a central estimate of 5.9 (95% range 3.0–8.7). A 5-year backtest shows a typical error of ±41.2%, with 80% of held-out values landing inside the 95% band.

+79%Change by 2029
5.9Projected 2029 index
3.0–8.795% range
±41.2%Backtest error
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 index95% low95% high
20256.03.18.8
20266.03.18.8
20275.93.18.8
20285.93.18.8
20295.93.08.7

Routes In Lower Great Lakes / St. Lawrence Plain

Routes recording Chimney Swift in Lower Great Lakes / St. Lawrence Plain.
HarmonsburgPENNSYLVANIA582023
Slippery RkPENNSYLVANIA371994
HiramOHIO302021
GarrettsvileOHIO251991
BranchportNEW-YORK212024
PeruOHIO161978
LattasburgOHIO132024
Valley CityOHIO132024
PenfieldNEW-YORK122024
ParishvilleNEW-YORK122024
MacdougallNEW-YORK112024
New SomersetOHIO101993
HighlandNEW-YORK92022
MaysvilleOHIO92012
CloverPENNSYLVANIA92024
HamburgNEW-YORK82024
MiddlefieldOHIO82017
Ballston LkNEW-YORK71995
EspyvillePENNSYLVANIA72024
Alder CreekNEW-YORK62004
Herner CrnsOHIO62024
Ferris CrnrsPENNSYLVANIA62023
AkeleyPENNSYLVANIA61979
TrumansburgNEW-YORK52023
ClintonNEW-YORK52013

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