It's close to the top.  They are not releasing the  water.   The mountains are full of snow.  It's been pouring rain all day & much more on the way.  The spillway was being tested to release 60,000 cfs but @ 26,000 cfs they shut it down due to vibrations, that was a couple weeks ago.  This could be soooo bad.  Here is another update from 5-11-19.  https://www.youtube.com/watch?v=h7ZxP-vTx3U   edit- this is a link to a live feed video of spillway https://www.youtube.com/watch?v=ZjEO_XAMT58