Heiser Slough
Lake in Mercer County, Illinois · on the USGS Toolesboro quadrangle
41.20788, -91.05981
Maps that show Heiser Slough
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Toolesboro, IA-IL
Detailed map of terrain, trails and roads
USGS topo, 2022
Wapello, IA
Old map for history, not navigation
USGS historical 15-minute topo (1946)
Wapello, IA
Old map for history, not navigation
USGS historical 15-minute topo (1949)
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
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).