Hello all. Found this site while trying to learn about leaks

I'm Matt from West Michigan, Grand Rapids area. Trying to fulfill a lifelong dream of having my own pond. Goal would be recreational, swimming and wildlife support. Have great Whitetail and bird populations. Would like some fish as well, maybe bluegill.

Unfortunately, my land is not ideal. Working on around 1 acre excavated,bermed pond. (I'll get some pics added soon). Much of my soil is red clay but went thru a couple of gravel veins too. We lined the whole bottom with blue clay. Found a couple of large defects at the bottom. Fixed those and it holds water at about 4 ft mark. Can fill above this but comes down to the same line. I have inspected the perimeter at this level and cannot find anything obvious. That whole process has been over about 2-3 yrs.

Trying to figure out next step. Is it worth continuing a search for the whole edge or should I just treat the whole edge with something like Soilfloc or bentonite? What would be a reasonable next step? Any advice would be appreciated.