Lake Iatt is a cypress-covered lake located in Grant Parish, Louisiana, United States. The lake is known for its largemouth bass, crappie and bream fishing . Many duck hunters also enjoy the fair population of migratory birds who pass through. There are several public boat launches for accessing the lake. It is .

Improvements The lake was awarded $1.14 million for flood mitigation. One sluice gate is to be replaced and installation of a new weir gate.

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