QA,

When I built my floating dock 3 or 4 years ago I had planned to anchor it to the bank with criss-crossed cables to add lateral stability. It is a 12x16 with a 4 x 16 gangway so it's not quite as long asy yours. After I got it in I was very impressed with the lateral stability without the cables, so I decided not to add them unless it was really necessary. I like pitching back under my dock since it's the only shade on the pond and the cables would be a hang-up liability. I watched it closely the first couple of years to ensure it wasn't a problem and it's as tight as the day I built it. We have had several near misses from hurricanes and on direct hit from a puny Cat-1. Just my experience but worth considering. Here is the URL to my photo server, you can back up one level to see the original build if you like.

https://public.fotki.com/jsing/hambrick-rd-1/dock-build-phase-2/?view=roll#1