Missouri DOT Noise Walls on I-70

As anticipated by the Missouri Department of Transportation (MoDOT), the project to widen I-70 (Route K) in the City of O’Fallon, MO required a sound abatement wall to reduce the noise for homes along the interstate.
Delta Precast was contracted by Wieser Concrete to provide structural design and drawings for approximately 24,280 square feet of precast concrete noise walls and posts, to run along the north side of the westbound interstate lanes.
The individual panels averaged 6’H x 24’L, while the posts were spaced at 25’ on center and averaged 12’ tall. Both panels and posts were manufactured with an ashlar stone form-liner on each side.
After the I-70 widening project, many locations approached or exceeded the Noise Abatement Criteria in a study conducted by the City of O’Fallon. These areas included four subdivisions and a middle school, of which the Hilltop Manor subdivision was deemed feasible and reasonable for a barrier installation. MoDOT defines reasonableness as the ability for noise barriers to achieve a maximum of 1,300 square feet per benefitted receptor and must provide a minimum of 7 dBA for 67 percent of first-row receptors. The precast concrete products were produced in two months and they were installed in about five days.