We use limestone down here too. On the sidewalk idea - it is a good source of heavy objects. A couple of things to watch out for though: 1. plenty of rebar and wire poking out (I cut a bunch off concrete chunks from a slab before reenforcing our low water crossing and it is a real pain - and that was in the winter). 2. Do you want what was on the sidewalks in your water? I guess you could pressure wash it first, but there was a bunch of junk on the stuff we were offered and we refused it, politely of course. Since you still have to haul it out and that is the most expensive part, may as well get the good stuff. Texas Crushed Stone is pretty cheap. The two axel dump trucks were about 250 a load for truck and rock to Lee Co. Not sure if the truck was TCS or load hire.
