First, let's convert the length of the log to yards, since the width of the stream is given in yards:
11 feet = 11/3 yards (since 1 yard = 3 feet)
Now we can check if the log is long enough to cross the stream:
11/3 yards = 3 2/3 yards
Since 3 2/3 yards is longer than 4 1/4 yards, the log is long enough to reach from one end of the stream to the other.