Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_13 (water__sqmi_ INTEGER, county VARCHAR, ansi_code VARCHAR)

### Question ###
Which Water (sqmi) has a County of benson, and an ANSI code smaller than 1759243?

### Accurate SQL ###

SELECT MIN(water__sqmi_) FROM table_name_13 WHERE county = "benson" AND ansi_code < 1759243