Manley Road Repairs: Clark County, Washington

In all four locations where Daybreak Creek crosses Manley Road were fish barriers in the form of culverts. As part of roadway improvements, these culverts would be replaced while assessing the stream habitat and addressing Endangered Species Act (ESA) permitting.

Endangered Species Act Compliant Culvert Replacements

Safety improvements would adjust the horizontal and vertical alignment of a nearly one mile stretch of Manley Road. Daybreak Creek – which intersects the road – exists within the Lower Columbia Recovery Domain for West Coast Salmon and other ESA-listed fish species, necessitating the preparation of environmental baseline documentation and permit strategy. An extremely steep channel slope downstream of the 20-ft wide culvert replacements would influence a design that features a fish-passable cascade-pool channel form. The channel design mimics existing geomorphic conditions and reduces the slope by creating cascades that are short in length and adjacent to resting pools, limiting the extended effort needed for fish to maneuver upstream. A private driveway also posed a fish barrier that would need to be replaced with contained culverts underneath. Otak team led this project through design and permitting including biological assessment and wetland delineation for State and Federal regulatory compliance.

A Complete Permit Strategy for ESA Compliance

Permitting for Manley Road covers everything from U.S. Army Corps of Engineers (USACE) 404/401 and Washington Department of Fish and Wildlife (WDFW) hydraulic project approval (HPA) authorizations, to a no effect habitat letter for USFWS species and the Regional Road Maintenance Program for National Marine Fisheries Service (NMFS) species, in documenting compliance with the ESA.

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