Pond questions...new guy here

hey guys. i am new to the newsgroup. i have been into my aquariums for a
few years...i had a 37 and just upgraded to a 75gallon last month.

i managed to aquire the property where i grew up and there is a small
pond....12x17 i believe. It is well over 50 yrs old. It is a natural
dirt bottom with no liner. i believe there is an artesian well that
feeds into the bottom of it so a liner is out of the question. the walls
are slowly cracking and beginning to cave in due to the ground
surrounding it. anyone have any ideas as to how to go about rebuilding
this pond so it lasts another 50+ years. the walls right now are a very
aged poured concrete about 6" thick. the one end wall originally was
block but has fallen in a long time ago...

would it make sense to pump out 90% of the water and dig around the
existing walls and recast them with a rebar cage to keep them from
pushing in again??? then remove the old walls with a jack hammer?