<Tr> <Td> 40 </Td> <Td> Yellowstone Lake </Td> <Td> Wyoming </Td> <Td> 136 sq mi </Td> <Td> 352 km </Td> <Td> natural </Td> <Td> </Td> </Tr> <Tr> <Td> 41 </Td> <Td> Falcon Lake </Td> <Td> Tamaulipas - Texas </Td> <Td> 131 sq mi </Td> <Td> 339 km </Td> <Td> natural </Td> <Td> </Td> </Tr> <Tr> <Td> 42 </Td> <Td> Lake Livingston </Td> <Td> Texas </Td> <Td> 130 sq mi </Td> <Td> 337 km </Td> <Td> man - made </Td> <Td> </Td> </Tr> <Tr> <Td> 43 </Td> <Td> Lake Roosevelt </Td> <Td> Washington </Td> <Td> 128 sq mi </Td> <Td> 332 km </Td> <Td> man - made </Td> <Td> </Td> </Tr>

What is the biggest man made lake in the us