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_3 ( date INTEGER, length VARCHAR, builder VARCHAR )

### Question ###
Which Date has a Length of feet 9inches (m), and a Builder of portland terminal company?

### Accurate SQL ###

SELECT AVG(date) FROM table_name_3 WHERE length = "feet 9inches (m)" AND builder = "portland terminal company"