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Mark Twain National Wildlife Refuge

Verified
Calhoun County, Illinois, 62006→|Mississippi River→

Location

GPS Coordinates

About This Ramp

Surface
Concrete
USGS2 data sourcesUpdated Mar 2026

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Mark Twain National Wildlife Refuge is a public boat ramp on Mississippi River in Calhoun County, Illinois (62006). GPS coordinates: 39.0638°N, 90.6976°W.