http://www.pondboss.com/forums/ubbthreads.php?ubb=showflat&Number=127745#Post127745
Esshup, check out my earlier thread on a floating dock. I have the same problem with water levels. The plank portion can roll on top of the dock. My water level has varied by as much as 8 feet. Dock Builders supplies both the rollers and the hinged hardware for the rigid portion of your pier. This may not be what you want to do, but it is one way to deal with fluctuating water levels.. du