APPROVED SOURCES
FABRICATOR ADDRESS TYPE OF FABRICATION
Contech Engineering Solution, LLC Wahoo, NE Riveted, Helical Lock Seam
Contech Engineering Solution, LLC Topeka, KS Riveted, Helical Lock Seam
Contech Engineering Solution, LLC Mitchell, IN Helical Lock Seam, Riveted
Contech Engineering Solution, LLC Shakopee, MN Helical Lock Seam, Riveted
Contech Engineering Solution, LLC Middletown, OH Helical
Contech Engineering Solution, LLC Portage, WI Riveted, Helical Lock Seam
Contech Engineering Solution, LLC Metamora, IL Riveted, Helical Lock Seam
Metal Culverts, Inc. Albert Lea, MN Riveted, Helical Lock Seam
Metal Culverts, Inc. Columbia, MO Riveted, Helical Lock Seam
Metal Culverts, Inc. Evansville, WI Riveted, Helical Lock Seam
Metal Culverts, Inc. Havana, IL Riveted
Metal Culverts, Inc. Jefferson City, MO Riveted, Helical Lock Seam
Metal Culverts, Inc. Maryville, MO Riveted
Illowa Culvert & Supply Company Low Moor, IA Riveted, Helical Lock Seam
L. Houston Company Hopkins, MO Riveted
Midwestern Culvert Limited Ankeny, IA Riveted, Helical Lock Seam
Thompson Culvert Company Sikeston, MO Riveted, Helical Lock Seam
True North Steel Fargo, ND Riveted, Helical Lock Seam
True North Steel St. Paul, MN* Riveted, Helical Lock Seam
*Distribution Center-Fabricated Pipe
For approved sources of Aprons and End Sections, see Appendix E