A culvert has an attachment at an entrance end for inhibiting beaver activity at the culvert where the attachment includes two panels coupled together at one end by a third panel portion or by a hinge to form a pivotal structure with each panel including a bottom rail placed on a ground surface extending from the culvert entrance and a plurality of upstanding bars at spaced positions along the bottom rail. The attachment is opened at the hinge line or the third panel portion so that the hinge line is located in front of the entrance with each panel extending back to a respective side of the entrance and fastened by a chain coupling to that side. The upstanding bars are arranged so that water passes therebetween to or from the entrance end and the bars are closely spaced so as to prevent passage of beavers to the entrance end.

A culvert-clearing system is provided. The system includes a base plate with alignment features, a pivotable winch assembly, and a scraper mechanism designed for bidirectional movement through a culvert. The winch assembly may be hydraulically powered and optionally retrofitted to existing winches using a conversion kit that integrates a hydraulic motor with a drive shaft via an adapter plate and coupler. The hydraulic motor is operated via a control unit and pump system to ensure proper torque delivery. A scraper assembly with angled arms and teeth is connected to a winch cable routed through a pulley assembly anchored at the far end of the culvert, enabling effective debris dislodgment and transport toward an accessible opening.

Two lengths of FRP rebar are formed into spirals and coupled at cross over locations to form a structure to be embedded into a cementitious material or covered in a cementitious material for repairing a form or in new construction.