About Us

Montana Underground Construction

Montana Underground Construction Inc. (MUC) was founded in the spring of 2004. MUC relied on Mike Hartnett, owner of Montana Underground Construction, with his 25 years of experience in general engineering construction. MUC specialized in infrastructure improvements for local city/town, and state municipalities. In 2006, during the housing boom, we began working with private owners and developers to bring their projects to market using the highest quality and latest technics in the industry. As the industry specification and procedures continually change and evolve, we implement these changes into our quality control program.



  • Inspection
  • Cleaning
  • Vacuum


  • Hydro excavation
  • Grubbing
  • On-site Cuts/Fills
  • Mass Export/Imports
  • Detention Basins
  • Water Holding Facilities (Man-made Lakes)


  • Utility Locate
  • Pipe Point Patching
  • AMERON Installation
  • Installation of many different pipe tyles (RCP, HDPE, PVC, Corruagted, Ductile Iron, Polybutylene, Copper Lines)
  • Precast Structures 
  • Septic Tanks
  • Wet/Dry Utility Trenching and Conduit Installation

Building Excavation

  • Basement and footing Excavation/Backfill
  • Utility Connections
  • Concrete Grades
  • Final Grades
  • Over Excavation and Compaction for Building pads


  • Subgrade Preparation/Grading
  • Finish Grades for Concrete/Asphalt Paving
  • Curbs/Gutters
  • Sidewalks
  • Concrete/Asphalt Paving

Driveway Maintenance

  • Paving
  • Seal Coat
  • Crack Seal
  • Patching
  • Saw Cutting
  • Striping
  • Curb Stops


Trout Unlimited Waste Gate Replacement

Trout Unlimited Waste Gate Replacement

Trout Unlimited Waste Gate Replacement


Waste Gate replacement at Benton Lake.

Hydro Excavation

Trout Unlimited Waste Gate Replacement

Trout Unlimited Waste Gate Replacement


Safely removes soil and debris with pressurized water.  Locate utilities safely and more cost effectively than a shovel or equipment.   

Helena Reservoir Seismic Retrofits

Trout Unlimited Waste Gate Replacement

Helena Reservoir Seismic Retrofits


Retrofitting seven existing water reservoirs with isolation valves that close automatically in case of an earthquake.

Contact Us

Drop us a line!

Montana Underground Construction, Inc.

5690 Glass Drive, Helena, MT 59602

(406) 495-9410


Monday - Friday: 8am - 6pm

Saturday: By appointment

Sunday: By appointment