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Ashland Road Bridge

Ashland Road Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: July 3, 2009

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Key Facts

Facility Carried / Feature Intersected
Ashland Road Over Hinkson Creek
Location
Columbia: Boone County, Missouri: United States
Construction Date and Builder / Engineer
1888 By Builder/Contractor: H. W. Sebastian and Company of St. Louis, Missouri (St. Louis Bridge and Iron Works)

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
103 Feet (31.39 Meters)
Structure Length
103 Feet (31.39 Meters)
Roadway Width
12 Feet (3.66 Meters)
Spans
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

This bridge is significant as a early, rare surviving example of a bridge built by a noteworthy regional bridge company. The bridge has been closed to vehicular traffic and reconfigured for non-motorized use in its original location. No major work was done on the truss structure itself however.

The bridge has unusual detail at the sway bracing / top chord connection, where bent metal bar is curled around with a hole for the main top chord pin present. Otherwise, the bridge is traditionally composed. The truss retains good historic integrity with the exception of the loss of the original railings.

Located near the University of Missouri, this six panel bridge that is made of wrought iron is in a location where it can be enjoyed by many.

Information and Findings From Missouri's Historic Bridge Inventory

Bridge Features

Superstructure: wrought iron, 6-panel, pin-connected Pratt through truss
Substructure: stone masonry abutments and wingwalls
Floor/decking: plywood deck over steel stringers
Other features: upper chord and inclined end post: 2 channels with cover and batten plates; lower chord: 2 punched rectangular eyebars; vertical: 2 channels with lacing (2 punched square eyebars at the hip; diagonal: 2 punched rectangular eyebars; counter: round eyerod with turnbuckle; lateral bracing: round rod with threaded ends; strut: I-beam; floor beam: I-beam, U-bolted to lower chord pins; guardrail: timber; portal builder`s plate: H.W. SEBASTIAN & Co. / BUILDERS / ST. LOUIS Mo.

Discussion of Bridge

In May 1888, when J.D. Little and a large group of local citizens petitioned the Boone County Court for a new bridge over Hinkson Creek, the setting was a rural one. The city of Columbia has since grown up around the site, but the iron truss that was built that year remains much as it did when it was completed. Actually, the 1888 bridge here was preceded by an earlier structure that carried the Columbia and Providence Road; Little's petition was for a permanent iron span to replace the deteriorating timber structure. After reviewing the petition, the court directed county road and bridge commissioner W.E. Wright "to examine the old bridge and the site and report the necessity of a new bridge and the probable cost of erecting same." Wright inspected the old bridge, surveyed the site and reported back to the court that a 103-foot truss would be necessary to span the creek at this point. The county then contracted with St. Louis bridge builder H.W. Sebastian to fabricate and erect the wrought iron Pratt truss for $1750.00, and it hired local contractors Bergman and Nichols to build the stone abutments. The Hinkson Creek Bridge was completed by the end of November 1888. The truss first carried mainline wagon traffic, then later secondary car traffic, and now it is closed and barricaded. The original deck and guardrails have been replaced, but the structure otherwise remains unchanged. The Hinkson Creek Bridge is historically significant as the last remaining example from what was once an extensive group of wrought iron trusses in Boone County. It is technologically significant as an early, well-preserved example of what was a mainstay structural type in Missouri: the pin-connected Pratt through truss. The bridge is also noteworthy for its association with H.W. Sebastian. Henry Sebastian and William Vliet began building bridges from their Kansas City office in the 1870s. Sebastian split from Vliet sometime before 1879, forming H.W. Sebastian and Company in St. Louis. In 1888 - as the Hinkson Creek Bridge was under construction, in fact - he incorporated his firm as the St. Louis Bridge and Iron Works. The Hinkson Creek Bridge is the earliest remaining truss in Missouri attributable to this seminal in-state bridge builder. It is thus both historically and technologically significant.

Bridge Considered Historic By Survey: Yes

View Original PDF Historic Bridge Inventory Sheet

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