DESCRIPTION
The Clearwater River Floodplain Restoration Project addressed major limiting habitat factors and impaired processes on the Clearwater River between river mile 2.3 and 3.8 through strategic placement of large wood structures and removal of nearly a mile of road from the historic floodplain. Historically, the Clearwater River meandered through a forested valley floor with large trees, a dense canopy, and a system of branching channels. The advent of timber harvest in the watershed and construction of a rail line (now road) in the Clearwater River floodplain for transport of timber in the early 1900s removed critical riparian structure from the valley floor and confined the floodplain. Loss of the riparian buffer has resulted in easily erodible banks due to root loss and associated soil cohesion, dramatic reductions in large wood debris recruitment to the stream channel, and loss of overhanging vegetation. The project installed 28 wood structures of varying types and sizes to meter natural wood through the system, trap sediment, and aggrade incised sections of the channel for the long term reconnection of a network of 19 side channels in the floodplain. The project also removed nearly a mile of stream adjacent road from the floodplain.
The overall goal of the project is to increase spawning and rearing capacity of the watershed for Spring Chinook, steelhead, coho, pink, bull trout, and coastal and resident cutthroat trout species. Realized benefits from the whole project include: reconnection of 14.5 acres of historic floodplain through road decommissioning and removal of 10 culverts, activation of 70 acres of floodplain through placement of wood structures and subsequent vertical rise of the channel bed to increase floodplain storage for ground water recharge, connection of 19 existing side channels and formation of new side channels through channel migration, dissipation of flood energy and potential redd scour through placement of wood structures, increase in quantity and quality of instream, pool, and refuge habitat through placement of wood structures,improvement of riparian function through removal of a stream adjacent road and establishment of a riparian corridor on former road prism through planting of 2,500 native trees.