Bluff Spring Fen
Swamp in Cook County, Illinois · on the USGS Elgin quadrangle
42.01392, -88.25452
Maps that show Bluff Spring Fen
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Elgin, IL
USGS topo, 2024
Elgin, IL
USGS historical 15-minute topo (1925)
Elgin, IL
USGS historical 15-minute topo (1940)
Elgin, IL
USGS historical 15-minute topo (1962)
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-28 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-05 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).