A maintenance surface sealing treatment, commonly referred to as a seal coat overlay, was applied to various roads within Bennett Spring State Park in Laclede and Dallas counties. This treatment was also be applied on Routes 32, 64 & 64A.

In December 2019, the Missouri Highways and Transportation Commission, in cooperation with the Missouri Department of Natural Resources, approved a contract with Blevins Asphalt Construction, which submitted the low bid of $189,000. Blevins Asphalt Construction was also awarded the contract for resurfacing Routes 32, 64 & 64A, after submitting the low bid of $842,100.

Project Details

When: 

The project took place in the Summer of 2020.

Total Cost: 

$1,031,100

What is a Seal Coat Overlay?

A seal coat overlay operation entails spraying a heated film of asphalt liquid on the road, followed by placing fine rocks or chips on top. The chips are then compacted to make them adhere to the roadway. Finally, the excess loose chips are swept from the surface, leaving an improved roadway that will hold up longer than it would have without the treatment.

These overlays are about one-third the cost of a conventional asphalt overlay, averaging $15,000 per mile as compared to an estimated $55,000 per mile for an asphalt overlay. This also extends the life of the pavement for an additional five to seven years. Seal coats also seals cracks and improves roadway traction.