Boone County, IN

 47 Small Structure Replacement (Des. 1800141)

The existing twin metal pipe structure under SR 47 in Boone County was heavily deteriorated and regularly blocked with debris. HWC designed a replacement structure with a single-span box large enough to convey the required flows and debris to reduce maintenance efforts. A practical design approach avoided unnecessary waterway impacts that would have triggered mitigation and cost. The project design included completion of hydraulics, a Level 3 environmental document, and right-of-way engineering. Utility impacts and associated right-of-way needs were minimized by vertically adjusting the overhead utility to provide adequate working room under it for OSHA requirements. This minimized both the utility’s costs and INDOT’s cost. The construction cost was $325,000.