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Planning & Research >  Spans of Time >  Historic >  Pratt Pony Contact Planning & Research

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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





    1900	Canadian	09N2820E1110009	  Kansas City Br.
    1905	Payne		60E0690N3190004	  Midland Br.
    1909	Noble		52E0470N3230007	  J.A. Crook
    1909	Washington	74E0330N3980001	  Missouri Valley Br.
    1910	Payne		60N3300E0530009	  Wichita Const.
    1911	Washington	74N4025E0300007	  Rochester Br.
    1912	Hughes		32N3820E1510006	  Missouri Valley Br.
    1913	Creek		19E0815N3720005	  Kansas City Br.
    1913	Payne		60E0620N3510006	  Canton Br.
    1915	Alfalfa		02E0090N2680009	  Kansas City Br.
    1915	Comanche	16N2470E1730007	  Boardman Co.
    1916	Alfalfa		02E0280N2510004	  C.G. Landon
    1918	Latimer		39N4520E1370005	  Boardman Co.
    1921	Bryan		07N3650E2190009	  General Const.

  The Pratt pony truss in its more conventional form, with inclined endposts and connected by pins, greatly contributed to improving the early roads of Oklahoma as it did elsewhere.  In lengths between 50 and 100 feet it enjoyed wide acceptance as a reliable and uncomplicated span in the years preceeding World War One.  The type could also be found in the inventory of all national and most regional builders, thus making it readily available and promptly shipped to construction sites.  One of the state's oldest documented bridges is a Pratt pony built by Kansas City Bridge in 1900 to cross a stream west of Union City, serving a typical purpose for that time by giving farmers safe passage for their wagons to local markets.
  Pratt ponies represent the work of many significant builders in the state, including the prominent Oklahoma City firm, the Boardman Company, and a few strictly regional companies whose structures are scarce.  J. A. Cook if Falls City, Nebraska, successfully contracted in north central Oklahoma early in this century and built a 96-foot Pratt in Noble County during 1909.

Figure 49.  Bridge 60N3300E0530009, a rare example of a truss biult by the Wichita Construction Company, is a 1910 Pratt pony span.  It stands northwest of the Stillwater Municipal Airport.   Bridge 60N3300E0530009, a rare example of a truss biult by the Wichita Construction Company, is a 1910 Pratt pony span.

Qualifying as a rare example in the state because of its builder is a Pratt pony span, dating from 1910 and located near Stillwater, that was produced by the Wichita (Kansas) Construction Company (Figure 49).  The company's brief existence ended in bankruptcy in 1913.  Many of these companies, operating out of small country towns, could compete with their bigger national rivals during the early 1900s, but their days were numbered, and few made it into the 1920s.
  All builders tended to make Oklahoma's Pratt pony spans with laced channel top chords, eyebar bottom chords, angles in the verticals, and pinned connections.  The presence of bolts in some early trusses is often treated as a sign of a moved structure or extensive repairs, prehaps resulting from a collapse.  Yet it also illustrates one of the great virtues of truss spans, they were designed to be dimantled, moved, and rebuilt at another site, sparing the expense of a new bridge.

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