The U.S. Army Corps of Engineers (USACE) – Huntington District and Muskingum Watershed Conservancy District (MWCD) marked the completion of the Dover Dam Safety Assurance Project with a ribbon cutting ceremony on March 31, 2015, in Dover, Ohio.
Brayman was the primary contractor for the $38 million, two-phase project that rehabilitated and brought the 78-year-old dam up to modern-day standards.
The first phase of the project included the design, fabrication and installation of a temporary steel access platform along the non-overflow section of the dam and was completed in 2013. This phase also included the installation of 36, multi-strand anchors drilled into the bedrock of the spillway section of the dam. The anchors ranged in size from 19-strand to 54-strand and were installed in holes ranging from 9 to 19 inches in diameter.
The second phase included the installation of 21 multi-strand anchors on the face of the dam and 83 anchors under water in the aprong. Anchor lengths varied from 103 to 153 feet.
A precast concrete parapet wall and cast-in-place retaining wall were installed to further increase the storage capacity of the pool behind the dam by 13 feet. These upgrades raised the allowable pool elevation to mitigate the threat of downstream flooding. The precast panels were constructed by Brayman Precast and designed to maintain the cosmetic integrity of the existing structure. The cast-in-place wall is supported on caisson foundations. Brayman also constructed a two-mile access road and significant site restoration.
Dover Dam was constructed in 1937 at a cost of $7.7 million. It is a dry dam, meaning it allows the Tuscarawas River to flow freely and only retains water when necessary for flood protection. Within the Huntington District’s 45,000-square-mile footprint, more flood control dams, levees and floodwalls have been constructed than in any other USACE district in the country. The Huntington District operates and maintains 35 dams, 25 Federal levees, and 9 locks and dams.