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List of Figures



History of Oklahoma Highway Bridges

The Historic Bridges of Oklahoma
Steel Truss Bridges
• King Post Pony
• Small Pratt (3 panel) Pony
• Truss Leg Bedstead Pony
• Pratt Pony
• Pratt Half-Hip Pony
• Parker Pony
• Camel Back Pony
• Warren w/ Verticals Pony
• Warren w/ Polygonal Top Chord Pony
• Warren Bedstead Pony
• Double Intersection Warren Pony
• Pratt Through
• Modified Pratt Through
• Parker Through
• Camelback Through
• Modified Parker Through
• Warren Through
• K-Truss
• Deck Truss
• Mixed Truss

Concrete and Stone Bridges
• Concrete Arch
• Rainbow Arch
• Stone Arch





    1911	Craig		18E0250N4350009	  Illinois Steel Br.
    1911	Muskogee	51N4120E0910006	  Muskogee Iron Works
    1914	Muskogee	51N4410E0840003	  Vincennes Br.
    1935	Kay		36E0230N3180005

  Based on evidence available from other states which have completed inventories of their historical bridges, the Parker pony trusses in Oklahoma may constitute an unusual goup of bridges.  Once again the design is a result of engineers trying to extend the value of the Pratt configuration.  In this case, the Parker curves the top chord of a Pratt, producing a sloping shape that requires less metal and reduces weight of the span.  Thus, curving the top chord made the bridge somewhat more economical than its counterpart with a parallel chord (Figure 52).  Certainly this concept contributed to making the Parker a popular design for large through trusses.  As a pony, however, it seemed to fill the need for spans of 85 to 110 feet and provided greater rigidity because of its riveted connections.  Based on its use in Oklahoma, the Parker pony had a relatively brief period of adoption, approximately 1908 to 1915.
  Where Parker ponies are documented--and the surviving sample is small (6)--they did not come from major builders.  The Vincennes Bridge Company if Indiana enjoyed its greatest success around Muskogee, and an 88-foot Parker pony at Fort Gibson provides an excellent example of this company's work.  However, the Illinois Steel Bridge Company of Jacksonville, Illinois, whose Parker span crosses a creek near Vinita, played only a small role in state bridge building.  A Parker pony identified as built by the Muskogee Iron Works may in fact have been a Vincennes' bridge erected by the local firm, since it is virtually identical to the span by the Indiana company.  In all cases, the Parker ponies performed a mundane task in carrying country roads over minor waterways.

Bridge 41N3350E0870000 in Lincoln County is the state's only king post truss.
Figure 52.  The Pratt pattern in the web members along with the curved top chord of this bridge identifies it as a Parker pony truss.  The Parker design was ordinarily utilized in much larger through truss bridges.  Bridge 36E0230N3180005 crosses a creek near Tonkawa in Kay County.

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