Unfortunately, other than sleeping with someone at the Corps who runs the dam, that's about as good as it's going to get.....
I'm willing to do that. Am I a bad person?
Seriously, upon analyzing that web site it is really a projection of releases planned by and for Southwest Power to create electricity based on demand projections. So, they may open two gates to create power, yet the Corps. might open other gates for lowering lake levels which may not be reflected in the projection. Nonetheless, it is another piece of useful information in determining river levels.
Interesting (to me anyway) that they show on their map the downstream at Tulsa measuring indicator as being located on the East side of the SW Boulevard bridge, when it is actually on the West side. Any rower will tell you to stay away from the East side when the water is down.