We wanted a large dock that was rock steady and that would last for years. After a lot of research we came up with this plan. Two 18 inch diameter 30 foot plastic culvert pipes for flotation make this dock super strong and able to take over 5000 pounds. It took 6 of us 1 1/2 days to build. Contact me for complete plans, detailed how to video, list of materials costs etc. Mark 250-967-4880 [email protected]