The sunken piers and boat-docks annoyed me enough to make a few models in Blender.

Tried normal-poly, but the models got way too large in size to be used, so here's a collection of low-poly models you can spread around in your scenery - no-one will notice the difference at more than 10ft anyway...

Only one texture is included for the planks/wood, but it can easily be swapped with whatever you want.

12 models included in the pierLP folder. You might need to swap the GUID's on these, but I'm not sure it will be a problem if you use the ones included.

Blender-file is included for easy modification.

Feel free to modify and use at own discretion. A mention would be nice, but not aquired... :-)