• Concrete
  • Timber
  • Gravel
  • Pre-cast



  • Welded Plate Girder
  • Tubular
  • Rolled Girder
  • Trail Bridges
  • Truss
  • Schools
  • River Crossing Ferries


Welcome to RTI Fabrication




100 accumulative years of experience with Steel and Fabricating:


  • Qualified welding staff
  • AISC Certification – Intermediate (Major) Bridge & Standard for Steel Building Structures since 2008.
  • Recent projects and good working relations with MDOT, DNR, Forest Service, State and Federal funding Projects.
  • Working with Private Forestry Bridge Contractors

If it's Steel we do it


  • Steel is our medium to demonstrate excellence.
  • Steel for the Future - Thats what we will do for you!
  • Quality Capability Timely ~ Steel for the Future.
  • Steel and Fabrication "It's what we like to do"!
  • Call us today!

Main Office


89 Kruger Rd

Plains, MT 59858


Phone :  406-826-5932

Fax       :  406-826-6872



Bob McCoskery

Phone :  406-544-5927

Email  :


Jamie Holzberger

Phone: 406-240-2470


Thompson River MT

Rocksuud Footbridge

Ski Back

Gangway AK

Big Hole River

Thompson River East - Thompson Falls MT - Highway 200.


The long "sag" bridge at the bottom of the hill east of Thompson Falls, MT.


Replaced by MDOT & manufactured at RTI Fabrication in Plains Montana.  Welded plate girders with a composite deck.


Opens up the back door to tourism and Glacier National Park.


MT MDOT - Tami Hembree, project manager:

"The girders for the Thompson River Bridge were fabricated in accordance with plans and specifications.  There were no construction issues.  RTI was accommodating to MDOT personnel".


MT MDOT - Robert Kelly, Inspector:

"Outstanding working relationship"


Sletten Construction - Great Falls - Don Charters, project manager:

"RTI was a very reliable and quality conscious supplier for the structural steel on the Thompson River Bridge project".

Rocksuud Footbridge - Whitefish MT


The Rocksuud Footbridge in Whitefish MT is just one link of the six bridges on the 40 miles of interconnecting trail systems.


Neal Structural Repair -  Kent Neal:

"The fabrication was neat, precise and well fitted.  The schedule exceeded everyone's expectations.  Deliver was professional & prompt.  Even with the close tolerance on the splice bolt holes, everything lined up great!  This was as close to a perfect product as any I have erected in my 30 years of doing this work".

Ski Back


Gangway - AK


Gateway to the Divide Valley


This bridge is built to withstand the fault bounded Divide Valley.   It is a Fracture Critical Bridge.

RTI Fabrication

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RTI Fabrication
RTI Fabrication
RTI Fabrication