Ditto on the last drop, paddle, paddle, paddle! Not a place for a novice to do roll practice!
Union is lots of fun, (relatively) clean as most of the water comes from Chatfield releases, and a great place to get the feel for water.
Below the top structure, the water can be kinda funny at lower levels (200 - 350 cfs), which makes it a great place for beginners to get a feel for reacting, with the water.
Hve a great time out there folks!