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is a variation on the Pratt truss. While the Pratt truss has braced diagonal members in all panels, the
Pennsylvania truss has half-length struts or ties in the top, bottom, or both parts of the panels. The Pennsylvania truss is named after the
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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. The
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of 200 feet (61 m), has the longest clear span of any county bridge still in use in
Wyoming, and is one of the most important historic bridges in Wyoming.
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341:. The bridge now crosses the Powder River 18 miles (29 km) downstream from Sussex on Johnson County Road 172 (Irigary Road).
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was established in 1915, and it crossed the Powder River using the new bridge, until the trail was rerouted through
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241:. The bridge was built in 1913 at Sussex, Wyoming, and moved in 1963 to Irigary Road. The bridge was listed on the
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Irigary Bridge, Spanning Powder River on County Road No. 254, Sussex, Johnson County, WY
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In 1963, a new concrete bridge was built about 200 yards (183 m) upstream from the
434:"Vehicular Truss and Arch Bridges in Wyoming TR Continuation sheet: EDZ Irigary Bridge"
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University and college buildings listed on the
National Register of Historic Places
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List of bridges documented by the
Historic American Engineering Record in Wyoming
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of Canton, Ohio. The bridge at Sussex replaced two earlier bridges at
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List of jails and prisons on the
National Register of Historic Places
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to the north a few years later. The road at Sussex eventually became
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The old steel bridge was moved by the Etlin
Construction Company of
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Road bridges on the
National Register of Historic Places in Wyoming
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National
Register of Historic Places in Johnson County, Wyoming
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498:", 3 photos, 2 data pages, 1 photo caption page
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at Sussex, Wyoming, about 20 miles (32 km) east of
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Relocated buildings and structures in the United States
299:. The parts for the new bridge were fabricated by the
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Buildings and structures in
Johnson County, Wyoming
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History of the
National Register of Historic Places
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307:, located about 6 miles (10 km) to the north.
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593:List of U.S. National Historic Landmarks by state
408:"Vehicular Truss and Arch Bridges in Wyoming TR"
1056:Pennsylvania truss bridges in the United States
1036:Historic American Engineering Record in Wyoming
985:National Register of Historic Places portal
481:https://en.wikipedia.org/File:PowderRiver23.jpg
291:awarded the contract for this bridge over the
201:Vehicular Truss and Arch Bridges in Wyoming TR
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318:was built the following year in 1914. The
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1031:Transportation in Johnson County, Wyoming
533:U.S. National Register of Historic Places
35:U.S. National Register of Historic Places
249:devoted to historic bridges in Wyoming.
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374:"National Register Information System"
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492:Historic American Engineering Record
379:National Register of Historic Places
243:National Register of Historic Places
440:accompanying three photos from 1982
432:Fraser, Clayton B. (May 24, 1982).
406:Fraser, Clayton B. (May 24, 1982).
1051:Steel bridges in the United States
948:National Historic Preservation Act
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1041:1913 establishments in Wyoming
901:Federated States of Micronesia
547:Architectural style categories
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104:Show map of the United States
316:Sussex Post Office and Store
247:Multiple Property Submission
16:United States historic place
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953:Historic Preservation Fund
932:American Legation, Morocco
190:Pennsylvania through truss
1021:Bridges completed in 1913
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894:Lists by associated state
207:NRHP reference
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875:Northern Mariana Islands
494:(HAER) No. WY-70, "
436:. National Park Service.
187:Architectural style
310:The small community of
239:Johnson County, Wyoming
237:bridge in southeastern
870:Minor Outlying Islands
853:Lists by insular areas
567:Keeper of the Register
320:Black and Yellow Trail
145:43.93944°N 106.15750°W
1066:Canton Bridge Company
572:National Park Service
552:Contributing property
412:National Park Service
384:National Park Service
305:Powder River Crossing
301:Canton Bridge Company
287:On February 4, 1913,
269:Pennsylvania Railroad
245:in 1985 as part of a
181:Canton Bridge Company
927:District of Columbia
150:43.93944; -106.15750
335:EDZ Irigary Bridge.
328:Wyoming Highway 192
141: /
79:Show map of Wyoming
273:EDZ Irigary Bridge
264:Pennsylvania truss
235:Pennsylvania truss
231:EDZ Irigary Bridge
164:less than one acre
27:EDZ Irigary Bridge
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557:Historic district
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386:. July 9, 2010.
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324:Arvada, Wyoming
312:Sussex, Wyoming
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834:West Virginia
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739:New Hampshire
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799:South Dakota
789:Rhode Island
784:Pennsylvania
764:North Dakota
478:
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415:. Retrieved
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293:Powder River
286:
283:Construction
272:
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228:
114:Nearest city
920:Other areas
880:Puerto Rico
714:Mississippi
629:Connecticut
259:Pratt truss
148: /
136:106°09′27″W
124:Coordinates
1010:Categories
829:Washington
749:New Mexico
744:New Jersey
619:California
474:2023 Photo
357:References
133:43°56′22″N
52:2023 Photo
839:Wisconsin
804:Tennessee
709:Minnesota
684:Louisiana
275:, with a
995:Category
824:Virginia
774:Oklahoma
754:New York
729:Nebraska
719:Missouri
704:Michigan
694:Maryland
679:Kentucky
659:Illinois
634:Delaware
624:Colorado
614:Arkansas
417:April 9,
345:See also
214:85000427
177:Built by
941:Related
844:Wyoming
819:Vermont
724:Montana
664:Indiana
644:Georgia
639:Florida
609:Arizona
599:Alabama
449:Gallery
779:Oregon
734:Nevada
674:Kansas
649:Hawaii
604:Alaska
540:Topics
297:Kaycee
253:Design
911:Palau
809:Texas
689:Maine
654:Idaho
169:Built
865:Guam
814:Utah
769:Ohio
669:Iowa
438:and
419:2013
277:span
257:The
229:The
172:1913
161:Area
209:No.
196:MPS
1012::
410:.
392:^
382:.
376:.
365:^
330:.
595::
525:e
518:t
511:v
421:.
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