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000-Redundant category - to be reused or deleted
3D Enterprises of Lexington, Kentucky (1)
?.R. Porter (1)

A & M Concrete Products Co. of Clear Lake, Iowa (1)
A & P Roberts Co. of Pencoyd, Pennsylvania (45)
A&L Construction Co. of Hattiesburg, Mississippi (1)
A. Bentley & Sons (1)
A. Guthrie & Co. of St. Paul, Minnesota (11)
A. Martini & Co. (1)
A. Morton Thomas & Associates of Rockville, Maryland (1)
A. Olson Construction Co. of Waterloo, Iowa (23)
A. Soda & Son (1)
A. Teichert & Sons Inc of Sacramento, California (1)
A.A. Davis Construction Co. (1)
A.C. Boyle & Co. of McGregor, Iowa (4)
A.C. Wood Construction Co. (1)
A.D. Briggs & Co. of Springfield, Massachusetts (9)
A.E. Shorthill Co. (2)
A.G. Ryan & Sons (1)
A.I. Savin Construction Co. of Hartford, Connecticut (1)
A.J. Baltes Inc. (1)
A.J. Cheff Construction Co. (1)
A.J. Yawger Co. of Indianapolis, Indiana (2)
A.L. Cook Construction Co. of Ottawa, Kansas (1)
A.L. Greenberg Iron Co. (1)
A.M. Cohron & Sons of Des Moines, Iowa (1)
A.M. Kennedy & Sons (27)
A.P. Poirot Construction Co. of Belleville, Illinois (3)
A.S. Miller & Sons of Eugene, Oregon (1)
A.S. Wikstrom, Inc. of Skaneateles, New York (1)
A.W. Lizinger of Cleveland, Ohio (1)
A.Y. Bayne & Co. of Minneapolis, Minnesota (12)
ABKJ Inc. of Seattle, Washington & Bangalore/Bengaluru, Karnataka, Republic of India (2)
AECOM of Los Angeles. California (3)
ANJAC Enterprises Inc. of Brooklyn, New York City, New York (1)
APAC of Kansas City, Kansas (1)
ARUP of London, England, United Kingdom (1)
Aadams, Thomas M. (1)
Aaron Vedder (1)
Abarca, Isidoro (1)
Aberthaw Construction Co. of Boston, Massachusetts (3)
Abrams, W.A. (2)
Achey, E.D. (1)
Ackley, Joshua (1)
Ackley, Samuel (1)
Acrow Corporation of America of Parsippany, New Jersey (20)
Adain Bros. (1)
Adam, John (1)
Adams Construction Co. (2)
Adams, Arthur C. (2)
Adams, H.C. (1)
Adams, Jack of Endee, New Mexico (1)
Adams, Julius W. (1)
Adams, Melvin O. (1)
Adams, Milo A. of Minneapolis, Minnesota (9)
Adams, W.A. (1)
Addison Hays (2)
Adgate, F.W. of Chicago, Illinois (1)
Adolph Green Construction Co. (1)
Adrian Construction Co. (1)
Advance Construction Co. of Waukesha, Wisconsin. (2)
Aetna Bridge (1)
Agnew Construction Co. (1)
Ake, George (1)
Alabama Bridge Corp. (1)
Alabama Dry Dock & Shipbuilding Co. of Mobile, Alabama (1)
Alabama Road Commission (1)
Alamo Construction Co. of San Antonio, Texas (2)
Albany Bridge Co. (1)
Alberici (1)
Alberici Constructors of St. Louis, Missouri (1)
Albert S. Granger (1)
Albina Engine & Machine Works of Portland, Oregon (1)
Albinson Construction Co. (1)
Alcoa Corp of Pittsburgh, Pennsylvania (1)
Alden & Lassig Bridge & Iron Works of Chicago, Illinois (19)
Alden, John F. of Cohoes, New York (1)
Alderman, E.S. (1)
Aldrich, C.S. of Guthrie Center, Iowa (1)
Aldrich, W.R. (1)
Alesghem & Sons Rope Co. (1)
Alex Findlay & Co. of Motherwell, North Lanarkshire, Scotland, United Kingdom (2)
Alexander & Higby of Des Moines, Iowa (1)
Alexander & Repass of Des Moines, Iowa (2)
Alexander, Archie Alphonso of Des Moines, Iowa (2)
Alexander, W.H. (1)
Alexandria Construction Co. (1)
Alfred Cook & James Allen (2)
Alfred Pancoast Boller (1)
All-Pro Construction Co. (1)
All-Steel Equipment Co. (1)
Allaman, Jacob (1)
Allan A. Myers, Inc. of Malvern, Pennsylvania (1)
Allen & Fulton of Topeka, Kansas (2)
Allen & Rowe (1)
Allen & Rowe -designers
Allen, C.E. (1)
Allen, McEvoy & Co. of Beloit, Wisconsin (2)
Allen, W.W. (1)
Allentown Bridge Co. of Allentown, Pennsylvania (1)
Allied Contractors, Inc. of Omaha, Nebraska (3)
Allied Structural Steel Co. of Chicago, Illinois (4)
Alm's House Workers (1)
Alpine Construction (9)
Alsbury & Co., A.A. (1)
Altman-Rogers Co. of Oklahoma City, Oklahoma (2)
Alton-St. Louis Bridge Co (2)
Ambler-Davis Co. (1)
Ambrose-Burdsall Co. (1)
Ambursen Hydraulic Construction Co. of Boston, Massachusetts (3)
AmerCom Corp. of Parsippany, New Jersey (1)
American Arch & Culvert Co. of Toledo, Ohio (2)
American Bascule Bridge Corp. of Pensacola, Florida (2)
American Bridge & Iron Co. of Roanoke, Virginia (2)
American Bridge Co. of New York (1,724)
American Bridge Company of Chicago, Illinois (14)
American Bridge Works of Chicago, Illinois (56)
American Civil Constructors of Littleton, Colorado (1)
American Coal Co., and Maryland Coal Co. (1)
American Concrete Co. (1)
American Construction Co. of Chicago, Illinois/Dallas, Texas/Houston, Texas (2)
American Consulting Engineers of Lexington, Kentucky (1)
American Iron Bridge Co. of Chester PA (1)
American Manufacturing Co. of Fort Worth (1)
American Paving & Construction Co. (2)
American Pile Driving Co. of Everett, Washington (1)
American Prestressed Co. of Centerline, Michigan (1)
American Railway Engineering (1)
American Roads, LLC (5)
American Steel & Bridge Co. (1)
American Steel & Wire Co. (2)
American Steel and Aluminum Co. (1)
Ames Construction Inc. of Burnsville, Minnesota (2)
Amis Construction Co. of Oklahoma City, Oklahoma (2)
Ammann & Whitney of New York City, New York (2)
Ammann, Othmar of Feuerthalen, Canton of Z�rich, Switzerland (12)
Amos Melberg Co. of Cedar Rapids, Iowa (9)
Anamosa State Penitentiary Convicts of Anamosa, Iowa (2)
Anden, Van (1)
Andersen Bjornstad Kane of Seattle, Washington (1)
Andersen Construction Co. of Portland, Oregon (1)
Anderson & Barr (1)
Anderson & Co. (1)
Anderson, Albert (1)
Anderson, Gust (1)
Anderson, Lars (1)
Anderson, O.A. (1)
Andersson, Arthur (1)
Andrew Spaulding (1)
Andrew Weston Co. of Rouses Point, New York (1)
Andrew, Charles E. (9)
Andrews & Locke of Baltimore, Maryland (1)
Andrews, D.H. (1)
Andrews, David H. (1)
Andrews, George H. (1)
Andrews, Tim (1)
Angeles Gravel & Supply Co. of Port Angeles, Washington (2)
Angier, Walter E. (7)
Angwin, Henry R. (19)
Anil Verma Associates, Inc. (1)
Anlaan Construction (2)
Annear, E.H. (2)
Anschutz, W.J. of Saginaw, Michigan (1)
Anthony Fry (1)
Anton Zwack of Dubuque, Iowa (2)
Aparicio, Martin (1)
Apollo Construction (1)
Appleby, Fred L. (3)
Appleby, Fred W. (1)
Appleby-Frodingham Steel Co. of Scunthorpe, North Lincolnshire, England, United Kingdom (1)
Appleton & Davis (1)
Applied EarthWorks, Inc. of Fresno, California (1)
Arcersinger-Morse Construction Co
Archibald M. Kennedy & Sons (7)
Archibald, Raymond (2)
Architectural Resources Group (1)
Argersinger-Morse Construction Co (1)
Arkansas Bridge & Steel Co. (1)
Arkansas Bridge Co. of Kansas City, Kansas (3)
Arkansas General Construction Co. of Little Rock, Arkansas (1)
Arkansas Highway Department (2)
Armajani, Siah of Tehrān, Islamic Republic of Iran (1)
Armstrong & Sons (1)
Armstrong & Ugland (1)
Armstrong Co. of Chicago, Illinois (1)
Armstrong, J.H. (5)
Arnold M Graton Associates Inc of Ashland, New Hampshire (12)
Arnold, Captain John (1)
Arnold, Cecil C. of Seattle, Washington (3)
Arnold, James (1)
Arnold, Justin (1)
Arnold, Samuel A. (3)
Arrow (Dynamics) Sports Cars (1)
Arrow Dynamics (1)
Arthur G. Leake & Co. (1)
Arthur H. Neumann & Brothers, Inc. of Des Moines, Iowa (3)
Arthur McMullen Co. of New York City, New York (4)
Artingstall, S.G. of Chicago, Illinois (1)
Artmann, Edwin of Lee, Texas (1)
Arute Brothers (1)
Arvid Grant & Associates of Seattle, Washington (2)
Ash, Charles (1)
Ash, Howard, Needles, & Tammen of Kansas City, Missouri (13)
Ash, John (1)
Ash, John W. (2)
Ash, M.R. (1)
Ash, Sig (1)
Ashbach Construction Co. (1)
Ashley, P.N. (1)
Ashton, Ned L. of Iowa City, Iowa (18)
Associated Contractors Inc. of Monroe, Louisiana (1)
Atkinson Construction (1)
Atkinson-Windle Co. of Chillicothe, Missouri (3)
Atlantic Bridge Co. of Charlotte, North Carolina & Roanoke, Virginia (12)
Atlantic Bridge Co. of Greensboro, North Carolina (1)
Atlantic County of New Jersey (1)
Atlantic, Gulf & Pacific Co. of New York City, New York & Sacramento, California (8)
Atlas Construction (1)
Atlas Machine & Iron Works of Arlington, Virginia (5)
Attica Bridge Co. of Attica, Indiana (38)
Audley General Contractors of Bow, New Hampshire (1)
Augustus J. Dupuis Co. of Detroit, Michigan (1)
Ault, J.C. (2)
Ault-Rich Construction Co. of Cassville, Missouri (5)
Austin Bridge & Road, Inc. (alternate name for Austin Bridge Co.)
Austin Bridge Co. of Dallas, Texas/Atlanta, Georgia (41)
Austin Bridge Co. of Dallas, Texas (2)
Austin Brothers Bridge Co. (alternate name for Austin Bridge Co.)
Austin Road Co. (alternate name for Austin Bridge Co.)
Austin, A.H. of Webster City, Iowa (6)
Austin, George F. of North Kingstown, Rhode Island (1)
Auza, Frank (1)
Aylett, Philip (2)
Ayres, Richardson of Hope, Arkansas (6)

B&O Mount Clare Shops of Baltimore, Maryland (22)
B&P Bridge Co., The (2)
B&W Concrete Co. of Newark, New Jersey (1)
B. Griffin & Son (1)
B. Perini & Sons, Inc. of Framingham, Massachusetts (1)
B.E. Curry Building Co. (1)
B.J. McGrann & Co. of Lancaster, Pennsylvania (2)
B.L.Pugh Co. (1)
B.P. Panas & Co. of Houston, Texas (1)
B.W. Candage & Sons of Seal Harbor, Maine (3)
BACH Steel of St. Johns, Michigan (16)
BNIM of Kansas City, Missouri (1)
BTE Concrete Formwork of Glenwood Springs, Colorado (1)
Babbitt, Charles (1)
Bagley, C.W. (1)
Bagley, Walter (1)
Bailey Bridge Co, Inc of Abilene, Texas (2)
Bailey Brothers (1)
Bailey, Alex C. of Philipsburg, Pennsylvania (1)
Bailey, E.W. (1)
Bailey, J.A (1)
Bailey, W.E. (1)
Bainbridge, Charles W. (1)
Baird Brothers of Pittsburgh, Pennsylvania (2)
Baird and Hodges (1)
Baker & Koontz of Carthage, Missouri (3)
Baker White Pine Lumber Co. (1)
Baker, Ira O. (1)
Balchin, W.G. of Providence, Rhode Island (1)
Baldwin, Archibald Stuart of Winchester, Virginia (1)
Baldwin, Issac (1)
Ball, Charles H. of East Windsor, Massachusetts (4)
Ball, Edward P. (1)
Ballard, Ephraim Jr. (2)
Balsey, Capt. Joseph (1)
Baltimore Bridge Co. of Baltimore, Maryland (8)
Banden, Butin & Bowman (3)
Banfield, T.H. (1)
Bangs, Anson, & Co. (1)
Banta & Mutersbaugh of Lake Charles, LA (1)
Barally & Ingersoll of Rochester, New York (3)
Barber Construction Co. (3)
Barclay, W.M. (2)
Barcus, L.G. (2)
Barham Brothers (1)
Barletta Materials & Construction Inc. (1)
Barlow & Mackey (1)
Barnard, Paul F. of Ames, Iowa (1)
Barnes, K.W. (1)
Barnes, W.A. of Storm Lake, Iowa (1)
Barnhardt, F.H. (1)
Barnhart Constructors, Inc. of Houston, Texas (1)
Barnsley, George T. (1)
Barnum and Counihan (1)
Baron & Hole (1)
Baronette (1)
Bart Moore, Inc. of San Antonio, Texas (4)
Bartlett & Kling Co. of Cedar Rapids, Iowa (4)
Bartlett & Ranney Inc. of San Antonio, Texas (1)
Basic Marine Inc. of Escanaba, Michigan (3)
Baskerville County Engineers of Birmingham, Alabama (1)
Basset, W.B. (2)
Bassi, D.M. (2)
Batcheler, Bowen, and Wolverton (1)
Bateman Contracting Co. of Nashville, Tennessee (1)
Bates & Rogers Construction Co. of Chicago, Illinois (42)
Bates, Onward of St. Charles County, Missouri (3)
Bates, R.E. (2)
Bates, Thomas C. (1)
Batson Brothers (1)
Bauer, Jacob L. (1)
Baumert, M. of Astoria (1)
Bay Shipbuilding Corp. of Sturgeon Bay, Wisconsin (1)
Bayne & Hewett of Minneapolis, Minnesota (3)
Beach, Lansing H. (1)
Beal, N.B. (1)
Bean & Co. (1)
Bear Creek Co. (1)
Bear Creek Construction Co. of Landisville, Pennsylvania (1)
Beard, Elmer H. (1)
Beard, John (2)
Beard, R.R. (1)
Beason Construction (3)
Beattie & Cornell (1)
Beatty, Balfour (1)
Beatty, E.S. of Blair, Nebraska
Bechly, Ernest C. (1)
Bechtel Corporation of San Francisco, California (2)
Beckel Iron Foundry & Machine Shop of Bethlehem, Pennsylvania (6)
Becker, Donald (1)
Becker, M.J. (1)
Beckwith & Quackenbush of Rome, New York & Mohawk, New York (1)
Bedford Foundry & Machine Co. (1)
Bedford Iron Works (1)
Bedwell Co. (1)
Beebe Orchard Co. of Chelan, Washington (1)
Beekman, Green of Oklahoma City, Oklahoma (1)
Beer's Building Co. of Seattle, Washington (1)
Beers & Doolittle (1)
Beighton & Spalding (1)
Beley Construction Co. of Livingston, Montana (1)
Believe to have been built by the York Safe and Lock Co.
Belin Construction Co. (1)
Bell & Associates of Kansas City, Missouri (2)
Bell & Bell of Watertown, Tennessee (2)
Bell and Breckinridge (1)
Bell, A.C. (1)
Bell-Bockel Co. of Altoona, Pennsylvania (1)
Bellefontaine Bridge & Iron Co. of Bellefontaine, Ohio (37)
Bellefontaine Bridge & Steel Co. (alternate name for Bellefontaine Bridge & Iron Co.)
Bellows Falls And Saxtons River Street Railway Co. (1)
Bellows, Robert P. (1)
Belmont Iron Works of Chester, Pennsylvania (4)
Belvidere Construction of Belvidere, Illinois (1)
Bement-Witt Lumber Co. of Shell Rock, Iowa (1)
Ben C. Gerwick Co. (4)
Ben Cole & Sons Construction Co. of Ames, Iowa (9)
Ben Construction Co. (2)
Ben Seufert Co. (1)
Bender, P.F. (1)
Benesch of Chicago, Illinois (2)
Benjamin Collins (1)
Benjamin Douglas Construction Co. of Ann Arbor, Michigan (1)
Benjamin Graeff (1)
Bennett & Talbot of Greensburg, Pennsylvania (2)
Bennett, A.G. (2)
Bennett, J.D. (1)
Bentley & Sons Co. of Jacksonville, Florida (1)
Bentley And Sons (1)
Benton, Robert (1)
Ben�tez-Rexach, F�lix of Isla de Vieques, Puerto Rico (3)
Berenz & Son Construction (1)
Berg, J. (1)
Bergen & Bergen of Franklin, Indiana (2)
Berger Partnership PS of Seattle, Washington (1)
Berger/Abam Engineers, Inc. (1)
Bergmann Associates (1)
Berkeley Steel Co. (1)
Berlin & Lovettsville Bridge Co. (1)
Berlin Construction Co. of Berlin, Connecticut (48)
Berlin Iron Bridge Co. of East Berlin, Connecticut (203)
Bernhardt Ahrens of Attica, Indiana (1)
Bernhisel Construction Co. of Chicago, Illinois (2)
Berriman & Anderson (1)
Berry, Jacob (3)
Berry, William M. (1)
Bert Bacon (1)
Bert Stark (1)
Bethlehem Pacific Coast Steel Co. of Seattle, Washington (1)
Bethlehem Steel Bridge Corporation of Steelton, Pennsylvania (5)
Bethlehem Steel Co. of Bethlehem, Pennsylvania (165)
Bette & Cring of Latham, New York (1)
Bey Construction Co. of Minneapolis, Minnesota (1)
Bibb, C.F. (1)
Bicknell, Warren of Cleveland, Ohio (2)
Big R Manufacturing (2)
Big Wabash Bridge Co. of Carmi, Illinois (1)
Biggs & Pauley of Winfield, Kansas (1)
Bigley, Richard A. (1)
Bill Barnard of Ames, Iowa (1)
Billings Bridge Co. (1)
Billmeyer, Nogel & Co. of Lewisburg, Pennsylvania (1)
Billner, Karl P. (14)
Biltolast Products (3)
Biltolast Products Inc. of Ft. Payne, Alabama (2)
Bingham, C.A. (1)
Bingham, Henry (1)
Bird, George of Harrisonville, Missouri (3)
Birdsall, George W. (2)
Birkemeier & Sarema of Portland, Oregon (1)
Birmingham Iron Foundry (2)
Birnie, Alexander (5)
Bishop, A.D. (12)
Bishop, C.W. (3)
Bishop, Jacob (3)
Bishop, Judson W. of St. Paul, Minnesota (1)
Bitner, Jonathan (3)
Bitterell, W.J. of Webster City, Iowa (1)
Bituminous Inc. of Pine Bluff, Arkansas (1)
Bjork, Carl (1)
Black & Veatch of Kansas City, Missouri (1)
Black Rock Bridge Co.. (1)
Black, William (2)
Blackburn & Whiteside of Mammoth Springs, Arkansas (1)
Blackshire & Blackshare (2)
Blackwell Engineering Co. of Merrifield, Virginia (3)
Blackwell, Roll (1)
Blair, John (1)
Blaisdell, Frank H. (1)
Blaisdell, Hiram W. (1)
Blake, E.J. (1)
Blakeley, C.W. (1)
Bland, J.C. (2)
Blankenstein, E. of Temple, Texas (1)
Block Bridge & Construction Co. of Cleveland, Ohio (1)
Blodgett Construction Co. of Kansas City, Missouri (4)
Blodgett, A.M. of Kansas City, Missouri (26)
Bloomfield Bridge & Culvert, Inc. of Bloomfield, Iowa (1)
Blount Brothers Construction Co. of Shreveport, Louisiana (1)
Blow & Cote Inc. of Morrisville, Vermont (8)
Blythe, William (1)
Boardman Co. of Oklahoma City, Oklahoma (11)
Bob King (1)
Bob Verner (1)
Bock, C.H. (1)
Bodine, S.L. (1)
Bodner, Pierce (1)
Boedecker, Fred (1)
Bogert-Carlough Co. of Paterson, New Jersey (1)
Boh Brothers Construction (1)
Bohn, H.M. (1)
Bohren, F. (1)
Bohrofen, Mathias of Saarbr�cken, Saarland, Germany (1)
Boise Construction Co. of Boise, Idaho (1)
Boise Iron Works of Boise, Idaho (1)
Boll, Charles (1)
Boller & Hodge of New York, New York (4)
Boller, Alfred P. of Philadelphia, Pennsylvania (9)
Bollman, James (2)
Bollman, Wendel of Baltimore, Maryland (26)
Bolton, C.M. (1)
Bond, H.D. of McMinnville, Oregon (1)
Bonebrake, F.T. (1)
Boner, C.P. (1)
Bontrager Construction Co. (1)
Bonzano, Adolphus (1)
Boody, Stone & Co. of Springfield, Massachusetts (1)
Booker, Kiehl & Whipple of Seattle, Washington (1)
Boomer, McGuire & Blakesley of Great Falls, Montana (1)
Booth & Flinn Co. of Pittsburgh, Pennsylvania (8)
Booth & Pomeroy, Inc. of Portland, Oregon (3)
Borchers, Perry E. (1)
Bordwell & Zimmerman of Calistoga, California (1)
Borg & Ericson of Chicago, Illinois (1)
Borneman, August (5)
Borntreger, Moses (1)
Borthwick, Pringle of Philadelphia, Pennsylvania (1)
Boss Construction, Inc. (1)
Boston & Maine Bridge Crew (1)
Boston Bridge Works of Boston, Massachusetts (105)
Bothers, Lindstrom (1)
Bottom, John (1)
Bottomfield, A.D. (1)
Boudrye, Sam R. (1)
Boulton, C.R. of Columbus, Ohio (1)
Bowen, W.F. (1)
Bower Bridge Co.. (1)
Bower, C.P. (1)
Bower, Jacob (4)
Bowerman & McCloy of Seattle, Washington (2)
Bowers Construction Co. (1)
Bowers, Abraham (1)
Bowers, J.S. of Whitesville, North Carolina (1)
Bowlby, Henry L. (1)
Bowman, Lloyd (2)
Boy Scouts of America (2)
Boyd E. Phelps Co. of Michigan City, Indiana (1)
Boyer, George (2)
Boyington & Rust of Chicago, Illinois (3)
Boyington, Rust, & Bruce of Chicago, Illinois & Marseilles, Illinois (2)
Boyle, Blair (1)
Boyle, Frank (1)
Boynton & Warriner of Cedar Rapids, Iowa (1)
Brackbill, Christian (1)
Brackett Bridge Co. of Cincinnati, Ohio (30)
Braden, Richard J. (1)
Bradley, W.E. (1)
Bradley, William (1)
Brady & Simpson (1)
Brainerd, Silas (1)
Braley, Zacheus (1)
Brandt, George (2)
Brandt, Jacob R. (4)
Bras, Glenn E. of Muskogee, Oklahoma (1)
Brasfield & Gorrie, LLC of Birmingham, Alabama (2)
Braun-Fleming-Knollman & Prior of Columbus, Ohio (2)
Brayman Construction Corp (1)
Brazos River Bridge Co. (2)
Breckenridge, W.L. of Chicago, Illinois (1)
Breeding, George W. (1)
Brendlinger, P.F. of Philadelphia, Pennsylvania (6)
Brennan, J.P. (1)
Brennecke & Fay of St. Louis, Missouri (3)
Brereton, T.J. (1)
Bresee, Jared N. (2)
Breslin Construction Co. of Louisville, Kentucky (1)
Bridge Commision (1)
Bridge Construction Corporation of Augusta, Maine (1)
Bridges, C.G. (1)
Bridgewater, John (1)
Bridgeway Civil Constructors, Inc. (1)
Briggs, Alexander (3)
Briggs, John C. (1)
Brink, John (2)
Briscoe Construction Co. of Stillwater, Oklahoma (1)
Bristol Steel & Iron Works of St. Louis, Missouri (1)
Britton Bridge, LLC of Knoxville, Tennessee (1)
Britton, Eugene (1)
Britton, Joseph A. (23)
Broad, J.C. (1)
Broadman Co. (1)
Brociner, Alexander (1)
Brockman and Walker (1)
Brode, W.M. (1)
Brogan Construction Co. of Des Moines, Iowa (2)
Brolley, Thomas (1)
Bromaugh, Walter (1)
Bronson, R.J. (1)
Bronx Asphalt Corporation of New York City, New York (1)
Brookfield Construction Co. (1)
Brooks & Dahlgren of Oklahoma City, Oklahoma (1)
Brooks & Mixon of Decatur, Alabama (1)
Brooks-Borg of Des Moines, Iowa (1)
Brookville Bridge Co. of Brookville, Ohio (33)
Bros, Hannam-Hickeys of St. Louis, Missouri (1)
Bros, McArthur of New York City, New York (4)
Bros, Wilson of Geneva, Illinois (1)
Brossman, Charles (1)
Broughton Lumber Co. of Underwood, Washington (1)
Broughton, Charles (1)
Broughton, Frank (1)
Brown & Mackenthum (1)
Brown & Root Inc. of Houston, Texas (10)
Brown Brothers of Lansing, Michigan (1)
Brown, Baxter L. (1)
Brown, Benjamin (1)
Brown, Curtis S. (1)
Brown, D.M. (1)
Brown, George I. (1)
Brown, Glenn (2)
Brown, J.R. (1)
Brown, James R. (1)
Brown, Joseph (1)
Brown, Thomas Ellis (3)
Brown, William H. (18)
Brown-Abbott Co. of Dallas, TX (1)
Brubaker, John T. (2)
Brubaker, M.N. (1)
Bruce, R.N. (1)
Bruecker & Granitoid Co. (1)
Bruley, Richard (1)
Brunner, Arnold W. of New York City, New York (1)
Brunnier, H.J. (1)
Bryan, C.A. (1)
Bryant, Josiah (1)
Buchanan Bridge Co. of Bellefontaine, Ohio (1)
Buchanan County Secondary Roads Department of Independence, Iowa (1)
Buchanan, A. of Chambersburg, Pennsylvania (2)
Buchanan, J.W. (6)
Bucher, Thomas C. (1)
Buchholz, C.W. (1)
Buck, Leffert L. of Canton, New York (6)
Buckeye Bridge Works of Cleveland, Ohio (21)
Buckeye Portland Cement Co. of Bellefontaine, Ohio (2)
Buckingham, Cathernius (2)
Buckland & Taylor Ltd. of North Vancouver, British Columbia, Canada (7)
Buckland and Taylor (1)
Bucklew, N.H. (2)
Buckley Realty Construction Co. of New York City, New York (1)
Buckman, O.H. (3)
Buckner Bros. of Cleburne, Texas (5)
Buckner, John F. of Cleburn, Texas (2)
Bud King Construction Co. of Missoula, Montana (1)
Buddington, J.E. of New Haven, Connecticut (2)
Buffalo Bridge & Iron Works of Buffalo, NY (1)
Buffington, Wilson (1)
Bugee, William A. (1)
Built by Town of Unity
Built by the Town of Andover
Bullen Bridge Co. (alternate name for Pueblo Bridge Co.)
Bumpy's Steel Erection of East St. Louis, Illinois (1)
Burch, G.F. (1)
Burch, W.B. (1)
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John Camp built the 1841 bridge (1)
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John M. Pittenturf built the 1871 bridge (1)
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Yohn & Ritter (1)
York Bridge Co. of York, Pennsylvania (27)
York Engineering & Construction Co. (1)
Yost Brothers (2)
Yost Construction Co. (1)
Youdall Construction Co. (1)
Young, Charles H. of Muscatine, Iowa (4)
Young, Charles O. (1)
Young, D.H. of Manchester, Iowa (7)
Young, Hugh E. of Chicago, Illinois (3)
Young, Robert A. (1)
Young, Stephen (2)
Young, T.W. (1)
Youngstown Bridge Co. of Youngstown, Ohio (27)

Zachrist Construction (1)
Zane, Noah (1)
Zartman Construction Co. of Northumberland, Pennsylvania (1)
Zaugg, Marion (1)
Zeigler, A.K. (1)
Zelmer & Forrest Tidwell (4)
Zenas King & Sons (1)
Zendala Construction Co. of Manitowoc, Wisconsin (2)
Zimmerly Bridge Co. (3)
Zimmerman Bridge Co. of Paris, Illinois (3)
Zimmerman, F.A. of Redding, California (1)
Zimmerman, O.B. (1)
Zimmerman, Roy (1)
Zitterell-Mills Co. of Webster City, Iowa (2)
Zmmerly Construction Co. of Paris, Illinois (1)
Zoli, Theodore (4)
Zook, Henry (1)
Zurmuhlen, Frederick (1)

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