So o fish a clearer glacial lake 100 ft depths but average is about 60ft. Water temp is 57 and I keep marking this in quarter mile or so. Tried a swimbait down there but no bites I'm thinking something thermal but surface is pretty cold and it's starting to clear up on lake so I think fall turnover is done. This is kind of like a cove  60ft deep main lake though you don't see this in 70ft. The line marks would only be 50ft and seem to be continuous with breaks here there. Main lake forage is smelt, lake has lake trout large and smallmouth pike and rainbows. Area of lake is 4 miles total. Let me know your thoughts. 

I'm guessing you forgot to post the pic?

 

Catfish