Has a College Football game ever ended 61-8?
Exactly once. On September 26, 1981, Delaware beat Princeton 61-8, and no College Football game before or since has ended that way. When it happened it was a scorigami, the first 61-8 in league history.
That makes 61-8 the 1820th most common final score out of 2,216 that have ever occurred in College Football. One point away, 62-8 has happened 2 times and 61-9 has happened 1 times.