APPROVED SOURCES CORRUGATED METAL CULVERT PIPE
FABRICATOR	ADDRESS	TYPE OF FABRICATION
Contech Engineering Solution, LLC	Ankeny, IA	Riveted, Helical Lock Seam
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
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