Based out of Helena, Montana, Four O Six Underground is renowned for being a leader in today’s underground trenchless technologies. After more than 13 years in the drilling industry, we pride ourselves on staying on the cutting edge of drilling technologies and specialize in telecommunications and horizontal directional drilling.

Four O Six was founded in 2013 by Helena native Beau Straub. He began professionally drilling in 2003 by rebuilding cable systems in the south as a contribution to hurricane relief. He later relocated his business to Denver and grew it to over 100 employees doing all aspects of telecommunications, underground directional drilling, traffic control, asphalt and concrete, and landscaping. In 2012, Straub returned to his Montana roots and officially started Four O Six Underground.

Today, Four O Six has 25 in-house professionals who are all expertly trained and highly competent in the industry. With over 40 years of combined directional drilling experience, we can offer the expertise, technology, safety and work ethic needed to complete your job. Four O Six is proud to be a Montana-based company but we also provide a wide range of services to clients in Wyoming, Idaho, North and South Dakota, and Colorado. To date, we have safely and successfully completed over 1 million feet of drilling.

Four O Six provides boring and horizontal drilling services that utilize advanced trenchless technologies. Trenchless drilling allows us to easily provide services to underground utilities like water, sewer, power, telecom and fiber communications. This drilling technology has a number of benefits for our clients including reduced expenses, time and labor. In addition to drilling, we provide services in small-scale asphalt and concrete work, traffic control, hydro excavating and commercial landscaping clean up and restoration.

All of our services help to maximize performance and efficiency at every level of every project. Regardless of the project, however, our ultimate goal remains the same. We are committed to safely providing quality services in the cleanest way possible that works towards bettering the community infrastructure in which we live and work.

hydro excavator
horizontal drilling

Safety Standards

Four O Six promotes a workplace where efficiency and safety go hand-in-hand. Comprehensive in scope and continuous in outlook, Four O Six’s safety program encompasses employee training, including site-specific safety orientations. We adhere to the safest construction practices and the highest standards of equipment maintenance. At Four O Six, we make safety a company-wide priority. Our aim is to maintain the safest work environment for everyone—clients, subcontractors, employees and the general public.


  • All crews complete a daily job hazard analysis to ensure that everyone working on the jobs site is aware of any hazards.
  • Four O Six drug tests all employees through the use of private drug testers.
  • Four O Six runs driver’s license checks on all employees.
  • Our employees have certifications that include HAZWOPER and OSHA10.
  • We strive for a zero level of accidents or incidents on all job sites and have over 700,000 hours without a lost time accident.