Irwin Lake
Reservoir in Mercer County, Illinois · on the USGS Aledo East quadrangle
41.24503, -90.71680
Maps that show Irwin Lake
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Aledo East, IL
Detailed map of terrain, trails and roads
USGS topo, 2024
Alexis, IL
Old map for history, not navigation
USGS historical 15-minute topo (1923)
Alexis, IL
Old map for history, not navigation
USGS historical 15-minute topo (1925)
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-28 (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).