No specific dates I'm afraid. I chased and chased but no one in the Hydro could provide me with any information.
As I understand it, the water level should be constantly falling through the summer and they want it low so that it can capture lots of rain during the wetter months. So, it should be pretty low now, falling further and filling up in October some time.
The only ways I can think of confirming this are;
[*]Find a local who passes along the A87 and ask them to check it out with a pair of binoculars[/*]
[*]Contact the Tomdoun Hotel. They have a key for the gate across the access road and loan it to passers-by who want to look at the bridge. They should be able to provide you with a reasonably up-to-date assessment.[/*]