CREATE TABLE table_8474 ("South or west terminus" TEXT, "North or east terminus" TEXT, "First year" FLOAT, "Final year" FLOAT, "Notes" TEXT)

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