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About Mainline

A Leader in Heavy Utility Construction

Mainline Contracting has been completing utility construction projects in the Rapid City and Black Hills area since April of 2000. We pride ourselves in constructing projects in a safe and timely manner that range in values from $5,000 to $5,000,000. Our clients consist of local municipalities, government agencies, and private developers. Our key employees have over 125 years of combined experience within our company that have contributed in building some of the areas most challenging construction projects.

At Mainline Contracting we strive to provide a safe working environment and quality projects for our customers, we achieve this by our attention to detail and our clear communication with our customers, vendors, subcontractors as well as our employees. We stand behind our work and have always completed our projects on time and believe in providing our customers with an excellent product.

Mainline's crew that was assigned to our project were professional throughout the project and assured that the City's expectations were met and exceeded. In spite of numerous project challenges which included confined site conditions, groundwater/creek seepage, dep bore pits, large cobble to bore through and period of extreme cold weather, Mainline Contracting completed the project with quality workmanship, on time and on budget. 

Kyle Mathis, PE,

Last summer we had the experience of reconstruction on our street. Fortunately for the city, Mainline Construction and Complete Concrete made it as painless as possible. I hope the city continues to use these two fine companies often. 

Milton & Rhonda Wright,

Mainline Contracting made an outstanding effort to exceed compliance expectations for the installation of the drainage improvements, crossings and box culverts for the Back 9 holes at the Elkhorn Ridge Golf Course. The site compliance record at this time is outstanding and is clearly a result of good team effort. 

Mainline Contracting Inc did an excellent job working with the residents affected by the project and providing the resources required to overcome the harsh weather conditions. They kept a positive attitude and were able to meet the substantial completion date set for the project without sacrificing the quality or workmanship of the construction. 

Hiene Junge,

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