Project Data

  • 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.