Alkali Creek Road Slope Stabilization and Stream Relocation

The project scope changed after major rainfall caused slope failure jeopardizing safety and

undermining the roadway.

Careful coordination and consideration and of structural alternatives led to cost savings and generated a project meeting client and public

needs.

Stream Relocation Project Scope

Road Widening and Improved Sight Distance Hydrology and Hydraulics Slope Stabilization and Flattening Erosion Control Landscaping Wetland Delineation and Mitigation Cultural Resources Inventory and Data Recovery PermittingAlkali Creek Relocation and Slope Stabilization ACEC Category J: Small Projects

Final Design

Stream Realignment Slope Flattening Hydraulic Modeling

Rock Buttress Landscape Design Wetland Restoration

Alkali Creek Relocation and Slope Stabilization ACEC Category J: Small Projects

Primary Technical Challenges

Constructability in Confined Area Overly Steep Slopes Shallow Bedrock and Dewatering Maintaining Traffic Throughout Construction 12-inch Water Main and Gas Main Right-of-Way Availability No Floodplain Impacts Avoiding Environmental Impacts 100-year Flood Event in Consecutive Years Protecting Wetlands & Salvaged Hydric SoilAlkali Creek Relocation and Slope Stabilization ACEC Category J: Small Projects