This barrier consists of two culverts, a smooth concrete culvert built on top of a squashed CMP culvert. The Washington Department of Fish and Wildlife described this as a total barrier. The top culvert is perched 1 above the stream and water must flow over the CMP. This project will replace the two existing culverts with a four foot diameter corrugated polyethylene pipe, countersunk to eliminating the plunge pool and restoring the natural stream bed.
