Gold Award – Route 36 Osborn Curve Reconstruction, DeKalb County, Mo.

Contractor: Emery Sapp & Sons*

Owner/ Engineer: Missouri Department of Transportation            

The Route 36 Osborn Curve Reconstruction project was a high priority project for the Missouri DOT based on the high number of traffic accidents that had occurred over the years due to the curve alignment at the intersection of Highways 36 and 33.

A 3/4-mile section of Highway 36 was completely removed and replaced to change both the horizontal and vertical alignments of the Osborn Curve, as it was known to locals. Both left and right hand turn lanes were added in both Eastbound and Westbound lanes of Highway 36 at the Highway 33 intersection. A total of 2,500 lineal feet of storm pipe along with precast drop inlets were installed to improve drainage through the project along with new signage and pavement marking.

The project consisted of 18,000 SY of existing pavement removal, 25,000 CY of Class A Excavation along with linear grading and compacting in cut to create the new alignment. All of the pavement on the project was PCCP pavement and consisted of 10,000 SY of 8.5 in., 4,500 SY of 7.5 in. and 6,400 SY of concrete A2 shoulder. The existing asphalt pavement was milled, stockpiled and used as aggregate base under the new concrete pavement.

The $1.9 million project was completed and fully open to traffic in only 88 days, and since opening to traffic, has greatly improved safety through this stretch of Highway 36.

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* ACPA member.