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_38 (tunnel VARCHAR, length__imperial_ VARCHAR)

### Question ###
What Tunnel has an Imperial Length of 307 yd?

### Accurate SQL ###

SELECT tunnel FROM table_name_38 WHERE length__imperial_ = "307 yd"