In reply to Ehmarra:
UU website says Thirlmere and Haweswater are at 63% capacity compared to average at this time of year 65% and last year 52%
Thirlmere water level is 5.7m below top water level.
Whether that means the boulders are exposed, I dont know.
I'm hoping to get to Castle Rock tonight so will take a look and report back if I make it, remember, and nobody else answers the question in the mean time.