The problem you might have with retaining wall block is the footing under them. Normally you set the first row on a layer of rock or road base. The thickness should be at least four inches, but if you are going more then four feet, then the base should be deeper. Four feet is sort of a magic number for blocks and when you need to engineer the soil behind the block.

The other problem would be with keeping material behind them. I'd wonder what you could use that wouldn't wash away or erode over time? Gravel is the only thing that comes to mind, but I don't know how it will work with the soil behind it.

Has anybody else done this in your area? It might be worth your time to go for a boat ride and see what's been used. Maybe go visit those people and get some first hand information from them on whether it works or if they'd do it again.

Eddie

Lake Marabou http://www.pondboss.com/forums/ubbthreads.php?ubb=showflat&Number=139488&fpart=1

It's not how many ideas you have, but how many you make happen.

3/4 and 4 acre ponds.