From my post in "types of wood for cover":
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In many midwestern impounds, Osage Orange (Maclura pomifera) is present as standing timber, washed up on banks (petrified roots and all), or as living shore trees. This tree will last indefinately--at least 30 years--in the water. It is common to find the thorns still present on Maclura pomifera that has been flooded and dead for 30+ years. After having used these trees as brushpiles, I would best describe them as investment structure. It is one of the most difficult (and and painful) species to process; and you may find your saw a bit duller after cutting it. But remove the twigs and find the "right spot" for it--it could potentially remain the "right spot" for the remainder of your fishing days. A live-cut Maclura won't take too much weight to sink, but a dead or washed up tree will take an exorbitant amount of weight to secure to the lake floor.
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Good luck!!
I wasn't born here, but I got here as fast as I could