DUII usually results in a ticket, followed by release with a court date a couple weeks away for arraignment.  

Sometimes a ticket is delayed if the police/prosecutor thinks a more serious charge may be warranted.  Like Assault, for example.  

In the meantime, someone who has been to the jail, taken the breathalyzer,  fingerprinted, and had their mug shot taken is not usually kept in jail from December 18, 2016 until January 4, 2017.

In Eugene, those accused of felonies aren't likely to be in pre-trial custody that long!  At least not until they have three or four prior convictions.