Clark Creek Water Main Relocation

The project consisted of replacing and relocating 350 feet of a 10-inch water main that was damaged by a land slide on Clark Creek Road in Cowlitz County. The replacement water main used approximately 280 linear feet of existing pipe, which was unaffected by the landslide.  The eastern portion was re-routed approximately 50 feet to the south of the existing water line to avoid the unstable landslide area.  Construction also included diverting Clark Creek, a fish-bearing stream, while the new pipe is being trenched across the creek.  Project tasks included completing a wetland determination and Level 2 habitat assessment, preparing a JARPA, coordinating with the U.S. Army Corps of Engineers, the County, the City, and the landowner and negotiating mitigation ratios with the Department of Fish and Wildlife.