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_8474 ( "South or west terminus" text, "North or east terminus" text, "First year" real, "Final year" real, "Notes" text )

### Question ###
What is the average First year that has a Notes of replaced by us 12 when i-94 replaced us 12, and a Final year larger than 1961?

### Accurate SQL ###

SELECT AVG("First year") FROM table_8474 WHERE "Notes" = 'replaced by us 12 when i-94 replaced us 12' AND "Final year" > '1961'