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Sentry About Sentry
At Sentry, we’re not just building structures—we’re building opportunity, trust, and lasting impact. Flexible. Innovative. Results.

Self-performing EPC firm and design-build general contractor delivering concept-to-completion in construction, architectural & engineering, steel, electrical, mechanical, plumbing, welding & fabrication, manufacturing, crane, trucking, oil & gas workover Headquartered in Watertown, South Dakota, we’re a full-service EPC and design-build construction firm that self-performs across construction, controls & automation, electrical, mechanical, steel erection, manufacturing, engineering, architecture, and more. We take pride in doing things the right way—with grit, integrity, and a relentless focus on results. Our teams deliver high-quality work across agriculture, industrial, commercial, renewable energy, manufacturing, and water/wastewater projects throughout South Dakota and beyond. From local jobs to multi-million-dollar facilities across the Midwest, we bring flexibility, innovation, and real-world problem-solving to every project. We believe in investing in our people, growing the next generation of skilled leaders, and riding for the brand every step of the way. That’s the Sentry way.

Did You Know? | Sentry EditionHow much time goes into managing a construction project before you even consider the work ...
10/20/2026

Did You Know? | Sentry Edition

How much time goes into managing a construction project before you even consider the work happening on-site?

According to a 2018 construction industry study by FMI and PlanGrid, professionals spent an average of 14.1 hours each week searching for project information, resolving conflicts, and dealing with rework.

That's a lot of time spent making sure things stay on track.
It's easy to notice the equipment, materials, and crews on a jobsite.

What we don't always see is the planning, communication, and problem-solving happening behind the scenes.

At Sentry, we appreciate the people who help keep all those moving pieces working together.

Sometimes, the most important work is the work you don't see.

Source: FMI / PlanGrid, Construction Disconnected (2018)

Do you have a passion for leading in the electrical industry?Sentry is looking for an experienced Electrical Superintend...
10/16/2026

Do you have a passion for leading in the electrical industry?

Sentry is looking for an experienced Electrical Superintendent to help lead our electrical teams and keep projects moving forward!

-Lead and coordinate field crews
-Oversee electrical project ex*****on
-Promote safety, quality, and teamwork
-Help deliver successful projects from start to finish

Bring your experience, leadership, and expertise to a team that's building something great!

Ready for your next opportunity?
www.sentryusa.com/careers

🎓Your Future Starts Here!Looking for an opportunity to build your career? Come meet the team from Sentry LLC at the Lake...
10/15/2026

🎓Your Future Starts Here!

Looking for an opportunity to build your career? Come meet the team from Sentry LLC at the Lake Area Technical College Career Fair!

📍 **Lake Area Technical College (LATC)**
🕚 **11:00 AM – 2:00 PM**

From Manufacturing and Electrical to Mechanical, General Contracting, Controls & Automation, and more, Sentry offers opportunities across a wide range of industries and career paths.

Stop by our booth, meet our team, ask questions, and discover what it's like to be part of Sentry!

Whether you're preparing to graduate or exploring your future career options, we'd love to connect with you.

🔗 Explore Sentry: https://sentryusa.com/

**Sentry | Flexible. Innovative. Results.**

Ever wondered what those buildings just down the road from Walmart are?That's SENTRY!You've probably driven past us coun...
10/14/2026

Ever wondered what those buildings just down the road from Walmart are?

That's SENTRY!

You've probably driven past us countless times, but have you ever wondered what we actually do?

We're more than just a construction company! Right here in Watertown, our teams help design, manufacture, build, install, and maintain projects across multiple industries.

So, what exactly does Sentry do?

We're made up of seven specialized divisions:

General Contracting – Managing construction projects from planning to completion.

Electrical – Powering businesses, facilities, and industrial operations.

Mechanical – Providing plumbing, HVAC, and mechanical installations.

Manufacturing – Custom steel fabrication, welding, CNC machining, and manufacturing solutions built right here in Watertown!

South Dakota Service – Structural steel er****on, crane operations, maintenance, and field services.

Controls & Automation– Designing and integrating the technology and control systems that keep operations running.

Workover– Supporting the oil and gas industry through specialized field services.

One company. Eight divisions. 50+ services. Countless possibilities.

From our manufacturing floor to construction sites across the region, our people are the driving force behind everything we do.

Take a look behind the scenes at Sentry and see some of the work our teams do every day!

We're proud to call Watertown home, and even prouder of the people who make Sentry what it is.

🔗 Learn more about us: https://sentryusa.com/divisions/

SENTRY | Flexible. Innovative. Results.

Our South Dakota Service team has been hard at work at Buena Vista Regional Medical Center in Storm Lake, Iowa!With stee...
10/12/2026

Our South Dakota Service team has been hard at work at Buena Vista Regional Medical Center in Storm Lake, Iowa!

With steel er****on nearly 90% complete, here's a look at what our crews have accomplished:

🔹 250,000+ pounds of steel erected
🔹 350+ pounds of welding rod used
🔹 12,000 Hilti shots

Incredible work by our crews bringing this project together!

Learn more: https://sentryusa.com/

Meet the crew behind the build.Our South Dakota Service Crew is handling steel er****on at the Watertown National Guard ...
10/09/2026

Meet the crew behind the build.

Our South Dakota Service Crew is handling steel er****on at the Watertown National Guard Vehicle Maintenance Shop project. These photos capture the coordination and hands-on work that go into bringing the structure together.

Proud of the people representing Sentry on the job.

See yourself working alongside this crew? We’d like to hear from you.

www.sentryusa.com/careers

10/09/2026
Our Sentry Manufacturing team recently knocked out some awesome custom safety guardrails for the Millbank Milk housing f...
10/07/2026

Our Sentry Manufacturing team recently knocked out some awesome custom safety guardrails for the Millbank Milk housing facility!

This project came together on a tight timeline, and our team put in some long hours to get everything designed, engineered, cut, welded, painted, and delivered while completing it all in-house!

From an idea on paper to a finished product on the jobsite, Sentry can handle it all.

Did you know Sentry’s Manufacturing team is capable of taking on projects like this from start to finish?

Our Sentry electrical team is hard at work on the Millbank Milk Housing Facility!This project is now in the final stage,...
10/05/2026

Our Sentry electrical team is hard at work on the Millbank Milk Housing Facility!

This project is now in the final stage, and it’s coming together nicely. Our team is pushing hard to get everything wrapped up next week!

This unique building has presented some challenges and required some extra effort from our crew, but they’ve continued to get the job done and keep the project moving forward.

We’re excited to see this one across the finish line!

Another project completed at Roy Lake State Park! The Sentry team recently completed this new building at Roy Lake State...
10/02/2026

Another project completed at Roy Lake State Park!

The Sentry team recently completed this new building at Roy Lake State Park near Sisseton, South Dakota. From project oversight and construction to electrical, plumbing, HVAC, and more, our team helped bring this project together from the ground up.

The new facility will serve as a headquarters for South Dakota Game, Fish and Parks officers and state park employees.

We’re proud to be a part of another project that will serve South Dakota communities for years to come!

Address

1928 Calvin Drive
Watertown, SD
57201

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

Telephone

+16057530880

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