Hi,
Where are the drop offs and where is the quarry you mention? Are those the small lakes on the way up to wall on the left? I have been there a few times now but usually only fish the area on the left side of the wall as you walk up, I think that's the east... Only ever caught in the small lakes on dry and nymph usually at the end of a frustrating session. The large ones in the main lake just don't seem interested a lot of the time. I once walked about half way around but really couldn't find a spot that looked worth spending time on.
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