The corner collector entrance gate and piping system project included detailed design, contract plans, and specifications for a 15-foot wide by 28-foot high entrance wheel gate for a surface collection system to enhance downstream migration of juvenile fish past the Second Powerhouse at Bonneville. The design included provisions to supply flushing water to fish transport channel and modifications for relocating the powerhouse unwatering pump discharge pipe in the conveyance channel.

Tetra Tech INCA prepared plans and specifications for the entrance gate and associated storage systems; design of piping systems which included relocating the unwatering pump discharge in the conveyance channel and piping for flushing water system; and design coordination with hydraulic and biological work.