Longest Division I Undefeated Streaks

Last Sunday, I listed the longest winning streaks.  Tonight, I have the longest undefeated streaks:

1)  Washington:  63 games (59 wins, 4 ties from 1907-1917)

2)  Michigan:  56 games (55 wins, 1 tie from 1901-1905)

3)  California:  50 games (46 wins, 4 ties from 1920-1925)

4)  Yale:  48 games (47 wins, 1 tie from 1885-1889)

4)  Oklahoma:  48 games (47 wins, 1 tie from 1953-1957)

Bonus:  From 1879 to 1908, Yale had 4 undefeated streaks of 40 or more games:  48, 47, 44, 42.  The Bulldogs squeezed in a 37 game undefeated streak too - between 1890-1893.