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Guntersville Lake Lower Black Warrior Pickwick Lake Upper Black Warrior Wheeler Lakeīull Shoals Lake Dardanelle Reservoir Frog-Mulberry Lake Conway-Point Remove Little Red Lower Arkansas Lower Arkansas-Maumelle Lower Mississippi-Greenville Lower Mississippi-Helena Lower Mississippi-Memphis Lower White Robert S. The list of references for all nonindigenous occurrences of Dreissena polymorpha are found here. Names and dates are hyperlinked to their relevant specimen records. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Interactive maps: Point Distribution Maps