- Client Name: Ohio Department of Natural Resources
- Project Location: Jefferson County, OH
S&ME evaluated the condition of a 77-year old dam located in Jefferson Lake State Park. The dam, which is 25 feet high and approximately 240 feet wide, creates a pool around which the park is located. S&ME performed soil borings, cores through the concrete monolith spillway, a condition survey of the concrete, a bathymetric survey of the lake, and a land survey of the dam and downstream area. With this information, stability and H&H analyses were performed to assess the factor of safety against failure during a flood. These analyses suggested that the existing spillway capacity is inadequate and significant overtopping of the dam may occur.
S&ME, in conjunction with our subconsultant Jobes Henderson, is in the process of developing construction plans to assure the long term performance of the dam. These improvements may consist of a new sheet pile wall at the toe of the spillway for scour attenuation, roller compacted concrete (RCC) overtopping protection, and a new lake drain. In addition, S&ME is developing inundation mapping associated with an Emergency Action Plan for the dam. In the future, it is anticipated that S&ME will assist Ohio Department of Natural Resources in administrating the construction of these improvements.