Beaver Creek Bank Stabilization

Beaver Creek Bank Stabilization - Augustine
Project Name: Beaver Creek Bank Stabilization Adjacent to the Augustine Subdivision

Project Map: See attached.

Estimated Cost: $400,000 covering engineering and construction

Estimated Start Date:
Topography Survey - February 10, 2017, lasting approximately one week. Read letter to neighbors.
Design Engineering - February to March 2017
Construction - 2017 to 2018, to be determined during design process and based upon permitting

Contractor: TBD

Joshua C. DeBower, P.E.
Foth Infrastructure & Environment, LLC
8191 Birchwood Court, Suite L
Johnston, IA 50131

City Staff Project Contact:
David Wilwerding, AICP
Community Development Director
City of Johnston

Project Description: In 2010 the City of Johnston completed a Watershed Assessment and Stormwater Management and Action Plan for the entire community. This plan identified 10 priority projects that were needed to address erosion, protect public and private property and improve water quality. One of these projects identified was the Beaver Creek Bank Stabilization adjacent to the Augustine subdivision. Severe bank erosion exists along the northern edge of the Augustine subdivision on the west bank of Beaver Creek. The height of the bank is over 20 feet and this area has seen active erosion since the flooding of 2008.

The project involves the armament of an existing storm sewer outlet to correct erosion and the installation of a Longitudinal Peak Stone Tow Protection (LPSTP) with stone tie backs. This method has already been used in another area along Beaver Creek successfully and is intended to stabilize the banks at the normal flow elevations and allows for the banks to rebuild themselves over time as the area behind the LPSTP will fill with silt deposited during high water events. This method avoids the need to use excessive amount of rip rap armament up the entire embankment.

Project Funding: The Beaver Creek Bank Stabilization project is funded by the Johnston Stormwater Utility, which was implemented in July 2012 to create a dedicated funding source for projects that reduce erosion, protect properties and infrastructure from flooding and to improve water quality within the City of Johnston. For more information on the stormwater utility, visit the stormwater projects page.