A watercraft storage structure for storing a watercraft comprises a plurality of supports, wherein each support includes a clamping bracket; a shelf slidably attached to the plurality of supports by the clamping bracket attached to each plurality of supports forming a watercraft storage area; and a support platform positioned within the watercraft storage area, wherein the support platform is adapted for supporting a watercraft; wherein the each clamping bracket includes a first plate and a second plate that operate to press against the support forming a frictional fit with the support.