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_7 (length___ft__ VARCHAR, name VARCHAR)

### Question ###
What is the length in feet of the Jiangzhou arch?

### Accurate SQL ###

SELECT length___ft__ FROM table_name_7 WHERE name = "jiangzhou arch"