The Shawnee River Myth: No Such River Exists in Illinois

There is no Shawnee River. The premise contains a geographic confusion between the Shawnee National Forest (real, 289,000 acres, southern Illinois) and a non-existent river of the same name.

Actual Rivers in the Shawnee Region

• Ohio River: Forms forest's eastern/southern boundary (1,579 km total)
• Mississippi River: Forms western boundary (3,766 km total)
• Cache River: Flows through Cypress Creek NWR (Wetland of International Importance)
• Big Muddy River: Drains north-central forest
• Saline River: Southeast tributary of Ohio

Freshwater Mussels in Regional Rivers

The Ohio and Mississippi Rivers in this region historically hosted 40+ unionid mussel species—one of Earth's richest temperate mussel faunas. Species included:

• Federally endangered: Fanshell, pink mucket, fat pocketbook, orangefoot pimpleback
• Threatened: Rabbitsfoot, sheepnose, spectaclecase
• State-listed: Butterfly, elephant ear, pistol grip, washboard

Conservation Crisis

70%+ of North American mussels are imperiled due to: dams (habitat fragmentation), sedimentation, pollution, invasive zebra/quagga mussels, commercial harvest (historical). The Shawnee region's mussels reflect this continental tragedy.

Why the Confusion?

"Shawnee" derives from the Shawnee people (Algonquian-speaking, Ohio Valley origins). Applied to: National Forest, Shawnee Hills (physiographic region), Shawnee Community College, Shawnee Town—but no river. The Cache River's cypress-tupelo swamps are the area's hydrologic jewel.

If you're studying mussels in southern Illinois, focus on the Cache River wetlands and Ohio River tributaries—where the real biodiversity persists.