<Tr> <Td> <Table> <Tr> <Td> </Td> </Tr> </Table> </Td> <Td> </Td> <Td_colspan="2"> Lock E19 (Frankfort) </Td> </Tr> <Table> <Tr> <Td> </Td> </Tr> </Table> <Tr> <Td> <Table> <Tr> <Td> </Td> </Tr> </Table> </Td> <Td> </Td> <Td_colspan="2"> Lock E20 (Whitesboro) </Td> </Tr> <Table> <Tr> <Td> </Td> </Tr> </Table>

When was the erie canal built and finished