By inlet and outlet I ment a stream, crick or overflow.

Do you have any LMB? you didn't mention them but it would seem odd if you didn't have any.
Are you shooting for good BG fishing? I have heard that walleyes can reduce BG substaintialy, even remove them from a lake. But, with out a river you will not have any walleye reproduction. So stocking large walleye could have a significant and controled impact on your BG. Also increasing the size of your SMB or stocking LMB could help correct a stunted BG population. LMB would probably remove most of the SMB in 5 years.