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Southeast Missouri / Lead Belt / Mississippi Corridor

Hughes Mountain puts columned rhyolite south of Potosi

Hughes Mountain Natural Area gives Washington County a sourced geologic landmark of Precambrian rhyolite, columned rock, glades, and a short trail.

Hughes Mountain adds a Washington County texture that cannot be swapped onto a generic Ozark page. MDC places the natural area south of Potosi and describes Precambrian rock outcrops tied to ancient volcanic activity in the St. Francois Mountains.

The local feature is the rhyolite formation called Devil’s Honeycomb. MDC explains that molten rock cooled and cracked into multi-sided columns, and it lists a one-mile trail to the top of Hughes Mountain.

For a visitor or local reader, this is not just “public land.” It is a county-specific geology note, and the MDC page is the right place to check access, rules, and directions before going.

References

Where this fits: this note belongs to Washington County. See every local note for the county on its page.

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Related local notes

More short, source-checked notes near this one.

Floating the Big River through Washington County The Big River runs through Washington County and is a recreational float stream, but water levels and access points are conditions to check, not constants. The Potosi ranger district is a federal land desk inside the county The Mark Twain National Forest keeps a Potosi/Fredericktown Ranger District office in Potosi, which helps explain Washington County's federal-land layer. Council Bluff Lake and Mark Twain National Forest land in the county Federal forest land and Council Bluff Lake give Washington County significant public outdoor access, but the rules and management differ from state parks and county land. Washington State Park: petroglyphs and Indigenous heritage near Potosi Washington State Park preserves petroglyphs left by Indigenous people, making it both a recreation destination and a place of cultural heritage that deserves respectful framing.

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