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vehicular bridges during the late nineteenth and early twentieth centuries. A truss bridge can carry the roadbed on top, in the middle, or underneath the truss. Bridges with the roadbed at the top or the bottom are the most common as this allows both the top and bottom to be stiffened, forming a box truss. When the roadbed is atop the truss it is called a
285:
is a bridge built using cantilevers, structures that project horizontally into space, supported on only one end. The steel truss cantilever bridge was a major engineering breakthrough since it can span distances of over 1,500 feet (460 m). The AJX bridge is the only surviving cantilevered deck
273:
bridge was invented in 1844 by Thomas and Caleb Pratt. A Pratt truss has vertical members and diagonals that slope down towards the center. The interior diagonals are under tension, and the vertical elements are under compression. Pratt truss bridges were the preferred design for medium-span
302:. The steel deck truss is 306 feet (93 m) long, with three spans. There are pin connections between the two approach spans and the cantilever span. The piers are a solid shaft concrete, and the roadway width is 20 feet (6.1 m).
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316:. The bridge is located several miles south of Interstate 25 exit 249, and it is about 7 miles (11 km) south of
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South Fork Powder River Bridge, On West
Service Road of I-25, Kaycee vicinity, Johnson County, WY
324:, and several Wyoming state agencies. The AJX Bridge is rated as "structurally deficient" by the
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University and college buildings listed on the
National Register of Historic Places
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278:. The AJX Bridge is a deck truss bridge, since the roadway is on top of the truss.
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List of bridges documented by the
Historic American Engineering Record in Wyoming
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National
Register of Historic Places listings in Johnson County, Wyoming
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List of bridges on the
National Register of Historic Places in Wyoming
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The AJX Bridge was built in 1931–32 by the Omaha Steel Works of
1033:
List of jails and prisons on the
National Register of Historic Places
320:. The future of the bridge is controlled by an agreement between the
1089:
Road bridges on the
National Register of Historic Places in Wyoming
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National
Register of Historic Places in Johnson County, Wyoming
571:", 14 photos, 3 data pages, 1 photo caption page
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241:. The bridge was built in 1931 across the South Fork of the
249:. AJX Bridge was built to provide a river crossing for
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Programmatic
Memorandum of Agreement Historic Bridges
309:(US 87), today the road has been renumbered as
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Buildings and structures in
Johnson County, Wyoming
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History of the National Register of Historic Places
666:List of U.S. National Historic Landmarks by state
1080:
1109:Historic American Engineering Record in Wyoming
1058:National Register of Historic Places portal
415:National Register of Historic Places portal
481:Vehicular Truss and Arch Bridges in Wyoming TR
201:Vehicular Truss and Arch Bridges in Wyoming TR
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27:AJX Bridge over South Fork and Powder River
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1104:Transportation in Johnson County, Wyoming
606:U.S. National Register of Historic Places
35:U.S. National Register of Historic Places
1134:Pratt truss bridges in the United States
261:devoted to historic bridges in Wyoming.
1129:Cantilever bridges in the United States
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450:"National Register Information System"
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565:Historic American Engineering Record
455:National Register of Historic Places
255:National Register of Historic Places
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1124:Steel bridges in the United States
1021:National Historic Preservation Act
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372:AJX Bridge marker on southern pier
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360:Detail view of AJX Bridge trusses
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974:Federated States of Micronesia
620:Architectural style categories
540:South Fork Powder River Bridge
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514:Federal Highway Administration
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326:Federal Highway Administration
322:Federal Highway Administration
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506:Cooney, Frederick L. (1986),
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104:Show map of the United States
298:, under a contract with the
259:Multiple Property Submission
16:United States historic place
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478:Fraser, Clayton B. (1985),
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10:
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1026:Historic Preservation Fund
1005:American Legation, Morocco
300:Wyoming Highway Department
1094:Bridges completed in 1931
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967:Lists by associated state
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286:truss bridge in Wyoming.
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207:NRHP reference
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948:Northern Mariana Islands
567:(HAER) No. WY-56, "
187:Architectural style
253:. It was placed on the
239:Johnson County, Wyoming
237:bridge in southwestern
943:Minor Outlying Islands
926:Lists by insular areas
640:Keeper of the Register
403:Engineering portal
305:Originally located on
145:43.62028°N 106.57694°W
645:National Park Service
625:Contributing property
486:National Park Service
460:National Park Service
257:in 1985 as part of a
1000:District of Columbia
391:Transport portal
150:43.62028; -106.57694
520:on October 21, 2011
348:photo of AJX Bridge
141: /
79:Show map of Wyoming
311:Interstate 25
307:U.S. Route 87
164:less than one acre
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630:Historic district
283:cantilever bridge
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223:February 22, 1985
181:Omaha Steel Works
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872:South Dakota
862:Rhode Island
857:Pennsylvania
837:North Dakota
547:September 3,
545:, retrieved
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524:September 3,
522:, retrieved
518:the original
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490:, retrieved
488:, p. 61
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314:service road
304:
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290:Construction
280:
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243:Powder River
230:
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114:Nearest city
993:Other areas
953:Puerto Rico
787:Mississippi
702:Connecticut
271:Pratt truss
235:Pratt truss
148: /
136:106°34′37″W
124:Coordinates
1083:Categories
902:Washington
822:New Mexico
817:New Jersey
692:California
492:August 29,
436:References
276:deck truss
231:AJX Bridge
133:43°37′13″N
52:AJX Bridge
912:Wisconsin
877:Tennessee
782:Minnesota
757:Louisiana
1068:Category
897:Virginia
847:Oklahoma
827:New York
802:Nebraska
792:Missouri
777:Michigan
767:Maryland
752:Kentucky
732:Illinois
707:Delaware
697:Colorado
687:Arkansas
378:See also
214:85000426
177:Built by
1014:Related
917:Wyoming
892:Vermont
797:Montana
737:Indiana
717:Georgia
712:Florida
682:Arizona
672:Alabama
852:Oregon
807:Nevada
747:Kansas
722:Hawaii
677:Alaska
613:Topics
265:Design
984:Palau
882:Texas
762:Maine
727:Idaho
245:near
169:Built
938:Guam
887:Utah
842:Ohio
742:Iowa
549:2012
526:2012
494:2012
346:HAER
269:The
229:The
161:Area
209:No.
196:MPS
1085::
512:,
484:,
468:^
458:.
452:.
328:.
281:A
668::
598:e
591:t
584:v
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