Maddox Creek culvert removal and habitat restoration project
Huxley College of the Environment
Department or Program Affiliation
Department of Environmental Studies
The EIA was completed as a class project for the ESCI 493 class of Huxley College of the Environment at Western Washington University in regards to a culvert removal proposal to help restore inaccessible salmonid habitat. A group of students performed an analysis of the environmental impacts that will arise from removing the culvert to open up fish passage making spawning and rearing habitat available for coho salmon, steelhead and sea-run cutthroat trout. The proposed project is to remove an eroding 6-foot diameter by 210-foot long culvert pipe that is acting as a fish passage barrier to traditional spawning and rearing habitat of sea-run cutthroat trout, threatened steelhead trout, and coho salmon. The culvert is situated in Maddox Creek with South Laventure Road to the northeast and residential housing to the northwest. Removing the culvert will expose approximately two miles of spawning and rearing habitat for spawning and rearing salmon and trout. The proposed action includes removing approximately 262 thousand cubic feet of fill covering the culvert, excavating the pipe, and restoring the riparian habitat. Alternatives to this action include: 1) installing a slip liner on the inside of the existing culvert and weirs systems inside the slip line and downstream in the channel to backwater the culverts outlet in order to flood the culvert to allow for fish passage; or 2) the “No Action” alternative which will leave the culvert and creek in its current condition. Mitigation for the proposed and alternative actions will consist of stabilizing the surrounding vegetation and soil using silt fences, planting, hydroseeding/fertilizing, and mulching and installation of erosion control mats for erosion and sediment control.
Environmental Impact Assessment
Subject – LCSH (for OAI)
Stream restoration--Washington (State)--Maddox Creek; Metal culverts--Washington (State)--Maddox Creek; Salmonidae--Habitat--Washington (State)--Maddox Creek; Fish habitat improvement--Washington (State)--Maddox Creek; Environmental impact analysis--Washington (State)--Mount Vernon
Mount Vernon (Wash.)
Environmental impact statement
Western Washington University
Bodensteiner, Leo R.,1957-
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Date Permissions signed
DonTigny, Madison; Hart, Thomas; Jones, Alexa; Ludden, Josh; and McKole, Maura, "Environmental impact assessment: Maddox Creek culvert removal and habitat restoration project" (2017). Huxley College Graduate and Undergraduate Publications. 71.