About $400,000 of the funding will pay to build a wall to prevent erosion that has caused Lower Miamisburg’s deterioration beneath the asphalt, leading to “landslide conditions” as the road runs along a hillside with a stream below.
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Miamisburg City Engineer Bob Stanley said the hillside terrain near the road’s edge and heavy spring rains in 2018 were contributing factors in causing the asphalt to buckle and separate – several inches in some cases.
And the city must construct a wall along the hillside to stabilize the ground below the road, Stanley said.
“A huge portion of (the cost) is in the wall,” Stanley said. “The rest of it’s in the drainage and the road” work.
City estimates indicate the “roadway reconstruction” work accounting for $600,000. There are also contracting fees for the Montgomery County Transportation Improvement District, which is consulting on the project, Stanley said.
Because of the extent of the work needed, the road between South Union Road and Dee Avenue will likely remain closed to traffic into the summer, he said.
Weather permitting, work is likely to begin in March on fortifying the ground and hillside, according to Stanley.
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That will involve installing three sections of wall, he said. They will include 70, 30-inch diameter concrete reinforced drilled piers at a depth of 25 feet and 140, 36-inch diameter concrete drilled plug walls at a depth of 11 feet.
After the hillside is stable, phase II of the project will include fixing the road itself, Stanley said. That work will involve reconstructing both lanes, and storm drainage work on Lower Miamisburg’s north side.
The city approved emergency legislation last week to fund the cost of the project with a State Infrastructure Bank loan of more than $1 million.
The legislation indicates Miamisburg Finance Director Jennifer Johns estimates the project will last at least 20 years.
The 10-year loan has a 3 percent interest rate and does not require payments until the third year, according to a memo from Johns. Semi-annual payments would begin in August 2021 and end in February 2029.
The county TID applied for the loan on the city’s behalf from the Ohio Department of Transportation’s SIB, records show.
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