A structure composed of vertical support bars or frames typically made of steel or concrete. A stanchion may be part of gate system and houses the mechanisms used to raise or lower a gate. A stanchion bay is a spillway section in which the frame creates a slot to hold stop logs or flashboards used to retain water in an impoundment. When stanchions are triggered by high flows and the logs or boards are released, flows discharge rapidly. In some cases, the logs or boards cannot be replaced until the impoundment level recedes below the elevation of the bay.