We have had the same trouble. We've tried the weed eater but there is just too much of it. This last mowing, we decided to attach a rope to the front end of a push mower. Then my husband walks around the top of the levee 8 or 10 feet ahead of me, and basically just keeps enough pull on the rope so that the mower doesn't drift down the slope and slide into the water. Easiest mowing we done so far. Just need to stay ahead so the discharge doesn't hurt him. And we only do the part that is steep. We are really trying hard to get bermuda on the levee. Maybe there is something that would be better.