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The '''EDZ Irigary Bridge''' is a historic [[Pennsylvania truss]] bridge in southeastern [[Johnson County, Wyoming]]. The bridge was built in 1914 at Sussex, Wyoming, and moved in 1963 to Irigary Road. It was placed on the [[National Register of Historic Places]] in 1985 as part of a [[Multiple Property Submission]] devoted to historic bridges in Wyoming.
The '''EDZ Irigary Bridge''' is a historic [[Pennsylvania truss]] bridge in southeastern [[Johnson County, Wyoming]]. The bridge was built in at Sussex, Wyoming, and moved in 1963 to Irigary Road. was placed on the [[National Register of Historic Places]] in 1985 as part of a [[Multiple Property Submission]] devoted to historic bridges in Wyoming.
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==Design==
==Design==
The [[Pratt truss]] 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 [[Pennsylvania truss]] 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 [[Pennsylvania Railroad]], which pioneered this design. The Pennsylvania truss was once used for hundreds of bridges in the United States but the design fell out of favor in the 1930s and only a few such bridges remain. The Irigary Bridge, with a span of 200 feet, 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.<ref name="MPS"/>
The [[Pratt truss]] 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 [[Pennsylvania truss]] 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 [[Pennsylvania Railroad]], which pioneered this design. The Pennsylvania truss was once used for hundreds of bridges in the United States but the design fell out of favor in the 1930s and only a few such bridges remain. The Irigary Bridge, with a span of 200 feet, 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.<ref name="MPS"/>


==Construction==
==Construction==
On February 4, 1913, [[Johnson County, Wyoming|Johnson County]] awarded the contract for this bridge over the [[Powder River (Montana)|Powder River]] at Sussex, Wyoming, about 20 miles east of [[Kaycee, Wyoming|Kaycee]].
On February 4, 1913, [[Johnson County, Wyoming|Johnson County]] awarded the contract for this bridge over the [[Powder River (Montana)|Powder River]] at Sussex, Wyoming, about 20 miles east of [[Kaycee, Wyoming|Kaycee]].


In 1963, a new concrete bridge was built about 200 yards upstream from the '''EDZ Irigary Bridge.''' The old steel bridge was moved by the Etlin Construction Company of [[Casper, Wyoming]]. The bridge now crosses the Powder River 18 miles downstream from Sussex on Johnson County Road 172 (Irigary Road).<ref name="MPS"/>
Johnson County, on 4 February 1913, awarded the contract for this bridge over the
Powder River near the town of Sussex to the Canton Bridge Company; it was completed
later that year. The structure was moved from that location in 1963 by the Etlin
Peterson Construction Company of Casper under contract with the Wyoming Highway
Department. Moved 18 miles to the Irigary Road, it again spans the Powder River
in its new location. The Irigary Bridge's span of 200' is the longest clear span
of any county bridge still in use in the state. It is exceeded in simple span
length by only one highway truss and one abandoned roadway truss, both 250' in
length. As one of only two pin-connected Pennsylvania throughs in the survey, it
is one of the most important bridges in Wyoming


A notable subtype of the Parker truss design is the Pennsylvania truss, named after
the Pennsylvania Railroad which used it extensively. With the diagonals braced by
sub-struts or sub-ties, the Pennsylvania represented a strengthening of the basic
Parker configuration. It has been used primarily as a railroad bridge, with less
usage as a vehicular truss. Nevertheless, four Pennsylvania trusses - two rigidconnected
with sub-struts and two pin-connected with sub-ties - are found in the
survey; all are included in this nomination.

erection date:
moved:
span length:
total length:
roadway width:
span type:
1913
210906'30 "
283'0"
14'2"
simple
Johnson County (over Powder River)
contractor: Canton Bridge Company Canton Ohio
mover: Etlin Petersen Const. Casper Wyoming
abutments: concrete sills on steel piles
piers: steel pile bents w/ concrete caps
roadway: timber decking
approaches: 39"4" steel girders
Single-span, steel pin-connected 10-panel Pennsylvania through truss w/ sub-ties
top chords: two channels w/ cover plates and lacing; bottom chords: paired eyebars;
verticals: eyebars and two channels w/ lacing; diagonals: eyebars; struts: two
angles w/ lacing; lateral and sway bracing: round bars; angle guardrails; decorative
builder's plate mounted over portal strut.
Johnson County Road CN16-254 milepost:
18.1 miles northeast of Sussex
USGS Hoe Ranch 7V quadrangle UTM:
0.1
T46N, R77W, S19.
13.407210.4865885
In 1844 Thomas and Caleb Pratt received a patent for what would be known as the Pratt
truss - one of the first of the scientifically designed truss bridges. The Pratt truss
resembled the Howe except the verticals were compression members and the diagonals,
tension. This had the effect of shortening the compression members, increasing their
theoretical crippling load and substantially strengthening the truss. The first Pratt
trusses, like Howe's, used a combination of wood for the compression members and iron
for tension but never gained the popularity of Howe's design because they required a
greater quantity of then-expensive iron. All-iron versions were fabricated later, and
as the comparative costs of iron (and later steel) came down, the Pratt truss became
the American standard for highways and railroads. Eventually, the variations of the
Pratt design began to appear: the Parker, with its polygonal top chords, Pennsylvania,
Baltimore, Kellogg and Lenticular trusses, all designed before 1900.
==References==
==References==
{{reflist}}
{{reflist}}

Revision as of 20:10, 29 August 2012


EDZ Irigary Bridge
Nearest cityKaycee, Wyoming
Arealess than one acre
Built1913
Architectural styleOther, Pennsylvania through truss
MPSVehicular Truss and Arch Bridges in Wyoming TR
NRHP reference No.85000427[1]
Added to NRHPFebruary 22, 1985

The EDZ Irigary Bridge is a historic Pennsylvania truss bridge in southeastern Johnson County, Wyoming. The bridge was built in 1913 at Sussex, Wyoming, and moved in 1963 to Irigary Road. The bridge was placed on the National Register of Historic Places in 1985 as part of a Multiple Property Submission devoted to historic bridges in Wyoming. [2]

Design

The Pratt truss 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 Pennsylvania truss 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 Pennsylvania Railroad, which pioneered this design. The Pennsylvania truss was once used for hundreds of bridges in the United States but the design fell out of favor in the 1930s and only a few such bridges remain. The EDZ Irigary Bridge, with a span of 200 feet, 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.[2]

Construction

On February 4, 1913, Johnson County awarded the contract for this bridge over the Powder River at Sussex, Wyoming, about 20 miles east of Kaycee. The parts for the new bridge were fabricated by the Canton Bridge Company of Canton Ohio. The bridge at Sussex replaced two earlier bridges at Powder River Crossing located about six miles to the north. The small community of Sussex, Wyoming grew up around the bridge, and the Sussex Post Office and Store was built the following year in 1914. The Black and Yellow Trail was established in 1915, and it crossed the Powder River using the new bridge, until the trail was rerouted through Arvada, Wyoming to the north a few years later. The road at Sussex eventually became Wyoming Highway 192.[2]

In 1963, a new concrete bridge was built about 200 yards upstream from the EDZ Irigary Bridge. The old steel bridge was moved by the Etlin Construction Company of Casper, Wyoming. The bridge now crosses the Powder River 18 miles downstream from Sussex on Johnson County Road 172 (Irigary Road).[2]

References

  1. ^ "National Register Information System". National Register of Historic Places. National Park Service. July 9, 2010.
  2. ^ a b c d National Park Service (1985), Vehicular Truss and Arch Bridges in Wyoming TR (PDF), retrieved August 29, 2012


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