That's true Otto, and I have stuffed my 3 acre pond. A great one is if your pond is full, take tires that you can get for free from tire stores or service stations,and drill holes in tread and sides of half the tire. The other half screw 3 -4 screws into the tire going all the way through to the inside of the tire. Set the tire upright with drilled holes at the top and the screws on the bottom. Pour some quick crete into the bottom of the tire with the screws (screws will hold quick crete in place) and mix in some water. Let it set, then drop them out of a boat anywhere you want them in your pond. The sand crete will drop first and the drilled hole end will stand up.
I also found a junk yard (some people call them antique stores) LOL, that had broken plastic tables, commodes, and sinks. Got them for almost nothing. Set them up in the pond before the water came up. Looked like you were suppose to sit on the commode at a table. LOL! Many people have things that would be safe to put in a pond and would be happy to have them hauled off.Quick crete is cheap and a great way to weight down holding things in place. Many of them are almost snag free for the lures.