- A&P Roberts Co. of Pencoyd, Pennsylvania (4)
- A.H. Austin (2)
- A.J. Tullock (1)
- A.M. Blodgett (1)
- A.P. Poirot (1)
- Albert G. Plagens (1)
- Alfred Noble (2)
- All-Steel Equipment Co. (1)
- American Bridge Co. of New York (42)
- American Bridge Company (1)
- American Concrete Co. (1)
- Angeles Gravel and Supply Co. (1)
- Atlantic Bridge Co. (1)
- Ault-Rich Construction Co. (1)
- Austin Bridge Co. of Dallas, Texas (1)
- Austin Brothers Bridge Co. (1)
- Baird Brothers (1)
- Bateman Contracting Co. (1)
- Bellefontaine Bridge & Iron Co. of Bellefontaine, Ohio (18)
- Bellefontaine Bridge & Steel Co. (alternate name for Bellefontaine Bridge & Iron Co.)
- Belmont Iron Works (1)
- Bement-Witt Lumber Co. (1)
- Benno Janssen (1)
- Berlin Construction Co. (3)
- Berlin Iron Bridge Co. of East Berlin, Connecticut (14)
- Berlin Iron Bridge Company, East Berlin Connecticut (1)
- Bethlehem Steel Bridge Corp. of Steelton, Pennsylvania (1)
- Bethlehem Steel Co. (1)
- Bontrager Construction Co. (1)
- Boston Bridge Works (2)
- Brackett Bridge Co. (3)
- Brackett Construction Co. (1)
- Brookville Bridge Co. (19)
- Buchanan Bridge Co. (1)
- Buckeye Bridge Co. (1)
- Buckeye Bridge Works (1)
- Built and owned by National Pipeline (1)
- Built by EEW King McComb, MS
- Built by J.P. Knapp (1)
- Bullen Bridge Co. (alternate name for Pueblo Bridge Co.)
- Burger Iron Co. (1)
- C. and F. Teaming and Trucking (1)
- C.A. Holvik (1)
- C.A.P. Turner (1)
- C.F. Lytle (1)
- C.F. Metzger (1)
- C.P. O'Reilly Construction Co. (1)
- Calvert Vaux (4)
- Canton Bridge Co. of Canton, Ohio (43)
- Capitol Construction Co. (3)
- Carl Leonardt (1)
- Carnegie, Phipps and Co. (1)
- Central Construction Co. (3)
- Central States Bridge & Structure Co. (2)
- Central States Bridge Co. (2)
- Chambers and Dobson (1)
- Champion Bridge Co. of Wilmington, Ohio (22)
- Champion Iron Co. (1)
- Charles Boll (1)
- Charles J. Glasgow (1)
- Charles S. Davis (1)
- Chicago Bascule Bridge Co. (1)
- Chicago Bridge & Iron Co. (1)
- Chicago Bridge Co. of Chicago, Illinois (2)
- Chillicothe Iron Co. (1)
- Cincinnati Bridge Co. (1)
- Civilian Conservation Corp (1)
- Civilian Conservation Corps (20)
- Cleveland Bridge Co. of Cleveland, Ohio (1)
- Clinton Bridge & Iron Works of Clinton, Iowa (8)
- Clinton Bridge Co. (1)
- Colorado Fuel and Iron Corp. (1)
- Columbia Bridge Co. of Dayton, Ohio
- Columbia Bridge Works (10)
- Columbus Bridge Co. (1)
- Continental Bridge Co. (1)
- Converse Bridge Co. (1)
- Converse Bridge Company (1)
- Cook & Ransom of Ottawa, Kansas (1)
- Corrugated Metal Co. of East Berlin, Connecticut (1)
- Coshocton Iron Works (1)
- Croghan Construction Co. (2)
- D.F. Jones Construction Co. of Little Rock, Arkansas (2)
- D.H. Young (1)
- Daniel Luten (1)
- David B. Steinman (2)
- David Renno (1)
- Decatur Bridge Co. (1)
- Delaware Bridge & Iron Co. (1)
- Des Moines Bridge & Iron Co. (1)
- Designed by Merril Butler and built by Atkinson Spice Co. (1)
- Designed by Merrill Butler (1)
- Detroit Bridge & Iron Works (2)
- Dildine Bridge & Construction Co. of Cameron, Missouri (4)
- E.L. Chambers (1)
- E.L. Corthell (2)
- E.M. Wood (1)
- EEW King McComb, MS (1)
- Ed B. Mooney, Inc. (1)
- Edge Moor Bridge Works (1)
- Edwards Construction Co. (2)
- Edwin Thacher (1)
- El Paso Bridge & Iron Co. (1)
- Elkhart Bridge & Iron Co. (2)
- Elmer Keeler (1)
- Elmira Bridge Works (1)
- F.W. Adgate of Chicago (1)
- F.W. Menke Stone & Lime Co. (1)
- Farris Bridge Co. (2)
- Federal Bridge Co. (4)
- Figg & Muller Engineering Group (1)
- Fitzsimons and Connell Co. (1)
- Forcum James Co. (1)
- Forrester-Swenson Construction Co. (1)
- Forsgren Brothers (1)
- Fort Pitt Bridge Works (6)
- Foster-Creighton-Gould Co. (1)
- Fox Construction Co. (1)
- Fred Luttjohann of Topeka, Kansas (7)
- Frederick von Emperger (1)
- George E. King Bridge Co. (1)
- George F. Cole (1)
- George S. Morison (5)
- Gordon Construction Co. (1)
- Graves Construction Company, Melvin, IA (1)
- Greenville Steel & Iron Co. (1)
- Groton Bridge Co. (11)
- Groton Iron Bridge Co. (1)
- Gustav Lindenthal (3)
- Guy James (1)
- H.B. Walton (1)
- H.G. Parker (1)
- H.H. Stoddard Co. (1)
- H.L. Maddocks Co. (1)
- H.P. Converse Co. (1)
- H.W. Sebastian & Co. (1)
- Harrington, Howard and Ash (7)
- Harry Churchill (3)
- Henry Hornbostel (1)
- Herman Garleb (1)
- Hewett Bridge Co. (1)
- Hewitt Bridge Co. (2)
- Hocking Valley Bridge Works (3)
- Holton D. Robinson (1)
- Home Engineering & Construction Co. (2)
- Home Engineering & Contracting Co. (2)
- Homer Hamlin (1)
- Howard M. Jones (1)
- Illinois Bridge Co. (1)
- Illinois Steel Bridge Co. of Jacksonville, Illinois (4)
- Illinois Steel Co. (1)
- Indiana Bridge Co. (3)
- Indianapolis Bridge Co. (1)
- Interstate Bridge Co. of Kansas City, Missouri (2)
- Iowa Bridge Co. of Des Moines, Iowa (18)
- Iowa Bridge Company (1)
- Ira G. Hedrick (4)
- J.A.L. Waddell (2)
- J.B. Klein Iron and Foundry Co. (1)
- J.C. Elois Construction Co. (1)
- J.D. Foy of Dothan, Alabama (1)
- J.H. Murray & Co. (1)
- J.J. Daniels (9)
- J.P. McNulty (1)
- J.S. Kidwell (1)
- J.S. Kidwell and C.F. Bibb (1)
- Jacobus & Winging Concrete Construction Co. (2)
- Jacobus & Winging Concrete Contractors
- James J. Burke & Co. (1)
- James O'Connor & Son (1)
- James Wordlaw Legg (1)
- John A. Roebling (2)
- John Alexander Low Waddell (1)
- John Beard (1)
- John Ericson (1)
- John H Moon & Sons (1)
- John Olsen (1)
- John R. Price and Brothers (1)
- Joliet Bridge & Iron Co. of Joliet, Illinois (4)
- Joliet Bridge Company (1)
- Joliet Bridge and Iron Company Joliet, IL (1)
- Jonathan Bitner (1)
- Jones Brothers Structural Steel Co. (1)
- Josef Melan (1)
- Joseph C. Elliott of Payson, Illinois (6)
- Joseph Dice (13)
- Joseph Kampeter (1)
- Joyce Brothers Construction Co. (1)
- Kansas City Bridge & Iron Co. (2)
- Kansas City Bridge Co. of Kansas City, Missouri (14)
- Kansas City Structural Steel Co. (1)
- Keliher Construction Co. of Little Rock, Arkansas (1)
- Kellog Bridge Co. (1)
- Kelly-Atkinson Co. (1)
- Keystone Bridge Co. of Pittsburgh, Pennsylvania (3)
- King Bridge Co. of Cleveland, Ohio (43)
- King Iron Bridge Co. (alternate name for King Bridge Co.)
- Koss Construction Co. (1)
- Kuyes and Work (1)
- La Crosse Bridge & Steel Co. (5)
- Lafayette Bridge Co. (2)
- Lafayette Engineering Co. (1)
- Lakeside Bridge & Steel Co. (2)
- Lassig Bridge & Iron Works (1)
- Leffert L. Buck (1)
- Levi Marks (1)
- Levy Construction Co. of Denver, Colorado (2)
- Lewis Moss (1)
- List & Weatherly Construction Co. (1)
- Lomas Forge & Bridge Works (1)
- Lomas Forge and Bridge Works Co. (1)
- Luten Bridge Co. of Knoxville, Tennessee (37)
- M.E. Gillioz of Monett, Missouri (5)
- M.E. White Co. (1)
- M.J. Patterson Construction Co. (1)
- M.K. Orr (2)
- Marsh Bridge Co. (1)
- Marsh Engineering Co. of Des Moines, Iowa (6)
- Marsh Engineering Company
- Marshalltown Bridge & Iron Works (1)
- Massillon Bridge Co. of Massillon, Ohio (31)
- Massman Construction Co. (1)
- Maxon Construction Co. (1)
- Maxwell Construction Co. (3)
- McClintic-Marshall Co. of Chicago, Illinois (8)
- McEachin and McEachin, Inc. of Little Rock, Arkansas (2)
- McGuire & Cavender (2)
- Melan Arch Construction Co. (1)
- Melvin B. Stone (1)
- Mercantile Bridge Co. (1)
- Meyer & Greenwald Construction Co. (1)
- Michelmann Steel Co. (1)
- Mid-West Construction Co. (1)
- Midland Bridge Co. of Kansas City, Missouri (8)
- Midwest Steel & Iron Co. (1)
- Miller & Borcherding Bridge Builders of St. Louis, Missouri (14)
- Miller's Garage and Construction Co. of St. Louis, Missouri (2)
- Miller-Hey Construction Co. (1)
- Miller-Taylor Construction Co. (1)
- Milwaukee Bridge & Iron Co. (2)
- Milwaukee Bridge Co. of Milwaukee, Wisconsin (1)
- Minneapolis Bridge Co. (1)
- Minnesota-Moline Power Implement Co. (1)
- Mississippi Valley Structural Steel Co. (1)
- Missouri Bridge & Iron Co. of St. Louis, Missouri (1)
- Missouri Valley Bridge & Iron Co. of Leavenworth, Kansas (19)
- Missouri Valley Bridge & Iron Works (5)
- Missouri Valley Bridge Co. (1)
- Modjeski and Masters (3)
- Morava Construction Co. of Chicago, Illinois (1)
- Morse Bridge Co. (7)
- Mt. Vernon Bridge Co. (16)
- Mt. Vernon Bridge Company (1)
- N.M. Stark & Co. (1)
- National Concrete Co. (1)
- National Construction Co. (1)
- Neely Smith & Co. (1)
- New Bremen Bridge Co. (4)
- New Castle Bridge Co. (2)
- New Columbus Bridge Co. (1)
- New Jersey Steel & Iron Co. (1)
- New York Foundation Co. (1)
- Octave Chanute (1)
- Ohio Bridge Co. (4)
- Oregonia Bridge Co. (9)
- Othmar Ammann (2)
- Owego Bridge Co. (8)
- Ozark Engineering Co. (1)
- Pan American Bridge Co. (2)
- Pandora Cement Block Co. (1)
- Parham Construction Co. (1)
- Patterson-Burghardt Bridge Co. (1)
- Paul Kingsley (1)
- Pencoyd Bridge (1)
- Pencoyd Bridge & Construction Co. (1)
- Penn Bridge Co. (18)
- Penn Steel Co. (1)
- Pennsylvania Bridge Co. (1)
- Pennsylvania Steel Co. (3)
- Perkins Bridge & Supply Co. (2)
- Peter Kiewitt Sons (1)
- Phoenix Bridge Co. (5)
- Pioneer Bridge Co. (3)
- Pioneer Construction Co. of Kansas City, Missouri (7)
- Pittsburg Bridge Co. (1)
- Pittsburg Steel Casting Co. (1)
- Pittsburgh Bridge Co. (1)
- Pittsburgh-Des Moine Steel Co. of Pittsburgh, Pennsylvania
- Pittsburgh-Des Moines Steel Co. (3)
- Porter Brothers Co. (1)
- Public Works Administration (1)
- Pueblo Bridge Co. of Pueblo, Colorado (13)
- Queen City Bridge Co. (1)
- R. W. Finke (1)
- R.L. Gaster Construction Co. (1)
- R.M. Murray (1)
- R.V. Milbank (1)
- Ralph A. Hoffman (1)
- Ralph Modjeski (4)
- Raymond Pile & Concrete Co. (1)
- Reynolds & Sutton (1)
- Richland Construction Co. (1)
- Riley-Bailey Construction Co. (1)
- Riverside Bridge Co. (1)
- Roberts Supply Co. (1)
- Rochester Bridge & Construction Co. (1)
- Rochester Bridge Co. (2)
- Rogers Iron Co. (1)
- Rouse Construction Co. (1)
- S.M. Dixon (1)
- Salle Construction Co. (1)
- Scaife Foundry & Machine Co. (1)
- Schuylkill Bridge Co. (1)
- Security Bridge Co. (2)
- Security Bridge Company (1)
- Smith Bridge Co. of Toledo, Ohio (22)
- Springtown Bridge Co. (1)
- St. Joseph Bridge & Iron Co. of St. Joseph, Missouri (3)
- St. Joseph Structural Steel Co. (1)
- St. Louis Bridge & Iron Co. of St. Louis, Missouri (4)
- Standard Bridge Co. (1)
- Steadfast Bridges (1)
- Steel & Lebby Knoxville, TN (1)
- Steel imported from Illinois (1)
- Strauss Bascule Bridge Co. (1)
- Strauss Engineering Co. (1)
- Stupp Brothers Bridge & Iron Co. of St. Louis, Missouri (15)
- Sverdrup and Parcel (5)
- The Foundation Company (1)
- Thomas Griffith (2)
- Thomas Slattery (1)
- Tillman Gaydon (1)
- Toledo Bridge Co. (5)
- Topeka Bridge & Construction Co. (1)
- Topeka Bridge & Iron Co. (8)
- Township Supply Co. (1)
- U.G.I. Contracting Co. (1)
- Union Bridge & Construction Co. (3)
- Union Bridge Co. (8)
- Union Iron Works. (1)
- Van Camp Brothers (1)
- Variety Iron Works of Cleveland, Ohio (3)
- Vincennes Bridge Co. of Vincennes, Indiana (12)
- Vincennes Steel Corp. (1)
- Virginia Bridge & Iron Co. (alternate name for Virginia Bridge Co.)
- Virginia Bridge & Iron Company (1)
- Virginia Bridge Co. of Roanoke, Virginia (2)
- W.G. Watt Construction Co. (1)
- W.S. Hewett (1)
- W.W. Allen (1)
- WPA (1)
- Waddell & Harrington (2)
- Waddell and Redrick (1)
- Walsh & Thomas (1)
- Washington A. Roebling (1)
- Wendal Bollman (1)
- West Arkansas Construction Co. (1)
- Western Bridge & Construction Co. (2)
- Western Bridge Co. of Harrisonville, Missouri (3)
- Western Bridge and Constuction Co. (1)
- Wheelock Bridge Co. (2)
- William H. Ferguson (1)
- William Sooy Smith (1)
- William T. Washer (1)
- Williamson and Williamson Bridge Construction (1)
- Winterburn and Lumsden (1)
- Wisconsin Bridge & Iron Co. of Milwaukee, Wisconsin (5)
- Witham Construction Co. (1)
- Wood and Witten (1)
- Woods Brothers Construction Co. (1)
- Works Progress Administration (90)
- Wrought Iron Bridge Co. of Canton, Ohio (59)
- Wrought Iron Bridge Company Canton Ohio (1)
- Yancey Construction Co. (1)
- Yant Construction Co. (1)
- York Bridge Co. (7)
- Youngstown Bridge Co. of Youngstown, Ohio (9)
- http://eng.lacity.org/projects/bridge/historical_gallery/Images/historical_12.pdf (1)
- http://eng.lacity.org/projects/bridge/historical_gallery/Images/historical_14.pdf (1)