Abstract: A frame rail assembly for a boat dock structure includes a first frame rail member, a second frame rail member and a corner bumper member. The first frame rail member is secured to a first side of the boat dock structure and includes a first channel and a second channel The second frame rail member is secured to a second side of the boat dock structure and includes a first channel and a second channel. The corner bumper is positioned at a corner between a first end of the first frame rail member and a first end of the second frame rail member. The corner bumper member includes a first section and a second section. The first section includes coupling members engaged with the channels of the first frame rail member, and the second section includes coupling members engaged with the channels of the second frame rail member.

Abstract: A frame rail assembly for a boat dock structure includes a frame rail member and a removable resilient rub-rail member. The frame rail member includes a first side configured for securing the frame rail member to a side of the boat dock structure; a second side opposing the first side; a first channel extending along a length of the frame rail member; and a second channel below the first channel, the second channel extending along the length of the frame rail member. An interlocking frame rail system for boat dock structures includes a first frame rail member, a second frame rail member, and an upper connector member extending along at least a portion of a length of the first frame rail member and at least a portion of the length of a second frame rail member.