A couple of things stand out reading this thread
1 - if the ice looks "off" or "funny" it probably is and we should stay away
2 - water shouldn't be pouring out of a hole .... that is a BAD sign - get away
3 - spud bars are the way to go .... you can literally test every spot you will put your foot .... i have a cheapie from Dick's that is fairly light and it takes me several good whacks to get through good ice .... if i can put it through in one or two whacks it is time to go home
My daughter went in a few years ago
..... it was mid winter with a foot plus of ice and we were walking back to the car fairly close to shore .... there was an area of funny looking ice and just as i was about to say i wouldn't step on the she did and it gave way .... i was still on solid ice and grabbed her by the hair and pulled her out.
It was only 3 or 4 feet deep and it turns out all the runoff from the rain enters the lake there and creates a weak spot.
So... watch for funny ice, water and buy a spud bar