Lake Helen
Reservoir in Hamilton County, Illinois · on the USGS Walpole quadrangle
37.99981, -88.61391
Maps that show Lake Helen
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Walpole, IL
Detailed map of terrain, trails and roads
USGS topo, 2024
Galatia, IL
Old map for history, not navigation
USGS historical 15-minute topo (1908)
Galatia, IL
Old map for history, not navigation
USGS historical 15-minute topo (1938)
Galatia, IL
Old map for history, not navigation
USGS historical 15-minute topo (1963)
Network to Freedom Brochure Map - National Underground Railroad Network to Freedom Program
National Park Service Maps · National Underground Railroad Network to Freedom Program
U.S. Fish and Wildlife Service Alligator Snapping Turtle Range (2024)
Fish & Wildlife Service Refuge Maps
Continental Glaciation Map - Tule Springs Fossil Beds National Monument
National Park Service Maps · Tule Springs Fossil Beds National Monument
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-16 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-27 (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).