Deep Creek is a tributary in the middle of the Kansas River drainage basin. The meandering stream flows generally east to west along westbound Interstate 70 (I-70) in the area south of Manhattan, Kansas. It experiences rapid onset high velocity flow conditions that had resulted in eroding banks along I-70, producing highway slope stability concerns and streambank stability concerns. The U.S. Army Corps of Engineers (USACE), Kansas City District has a long-established emergency streambank stabilization program, carried out under Section 14 of the 1946 Flood Control Act. A project to stabilize two areas of Deep Creek was undertaken through partnership between the USACE and the Kansas Department of Transportation (KDOT). HNTB was contracted by the USACE as a design consultant for the project. The design and construction, completed in the Spring of 2013, resulted in the protection of vital transportation infrastructure through sustainable practices and enhancement of the stream ecology. Longitudinal Peaked Stone Toe Protection (LPSTP), stone slope revetment, and bendway weirs were combined with plantings of willows, shrubs, and flowers. The rock structures and plantings work together to stabilize the highway, stabilize the stream, and preserve and promote a healthy ecology within the stream reach. This paper discusses the challenges involved with the project, the hydraulic design and stabilization techniques, and ecological influences. The main stabilizing features will ultimately blend into their surroundings. In-stream habitat will be formed as the Bendway Weirs create disturbance in the stream flow. The pool and riffle complex is encouraged by the stabilization design and the placement of the thalweg off of the ends of the rock features. Scour will occur beyond the Bendway Weir toes and help to form pools while shallower, calm areas will be created in certain sheltered areas closer to the bank. The paper demonstrates how these types of projects can be successfully done in a sustainable way. It shows a progression of the project site from pre-design to post construction.
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