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Mile Creek Road Bridge

   


Mile Creek Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: September 11, 2015
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Key Facts

Facility Carried / Feature Intersected
Mile Creek Road Over Mile Creek
Location
Rural: Knox County, Ohio
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
52.2 Feet (15.9 Meters)
Structure Length
52.2 Feet (15.9 Meters)
Roadway Width
13.5 Feet (4.1 Meters)
Spans
1 Main Span(s)
NBI Number
4237617

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This bridge is potentially one of the oldest pin-connected Pratt highway truss bridges in Ohio. Its details are more like those found on 1870s bowstring truss bridges, and this bridge may indeed date to that period as well. These details include cast iron connection assemblies and bearings (found on the bottom chord), and use of star iron for the outriggers. On this basis, The Historic Bridge Inventory suggested a ca. 1875 construction date which seems reasonable. The Ohio Bridge Inventory listed an 1876 construction date, which certainly is reasonable. However its unclear why that date was not noted in the Historic Bridge Inventory.

The Historic Bridge Inventory thought these details looked like the work of the Wrought Iron Bridge Company, and it may be, however this was a prolific company and among the many surviving examples of their works, there are zero surviving Pratt trusses by the company with these details. Other companies in this period used castings, star iron (cruciform) in their bowstring connection details as well.

Regardless the truss is one of the rarest in Ohio and has a high level of significance.

The truss no longer functions as steel bents were added to turn the bridge into a multi-span beam bridge. The bearings are buried in dirt. This bridge either needs to be restored in place or the trusses should be salvaged, restored, and reused in a new location such as a park or trail for pedestrian use.

Information and Findings From Ohio's Historic Bridge Inventory

Setting/Context

The bridge carries a 1 lane, unimproved road over a stream in a rural area of active farms. It is located on a straight section of road and is posted for 6 tons.

Physical Description

The 58'-long pin-connected Pratt pony truss bridge is supported on stone abutments. The upper chords and inclined end posts are traditionally composed, but the lower chords and diagonals are plate. The verticals are rolled I section, and the floor beams, also rolled I section, are located above the lower chords and supported on them. The upper panel points are pinned, but the lower connections as are composed a ingenious cast connecting pieces for both the diagonals and counters with upturned ends and the fittings to hold and stabilize the verticals and floorbeams. Some interior panels have cruciform-shape outriggers that also provide stability. There is some impacted rust on the upper chords and observed impact damage to at least one vertical.

Integrity

The bridge has been underpinned, converting it to a 3-span bridge for inspection reporting purposes, but the trusses themselves are not altered. Impacted rust on upper chords.

Summary of Significance

The cast- and wrought-iron pony truss bridge dates stylistically to ca. 1875, and its details represents the experimentation characteristic of the development of the bridge type. Stylistically it appears to be a very early Wrought Iron Bridge Company (WIBC) bridge. While the upper chords and inclined end posts are built up box sections composed of plates and channels, the lower chords, verticals, and how they are connected reflect the ingenious and idiosyncratic thinking about connections and transfer of stresses that is the hallmark of the pre-standardization era. Many of the details, like using plate for the lower chord and diagonal members, placing the rolled section floor beams above the lower chords, and the cast iron connecting pieces to join the members and accommodate the stress transfers, are commonly seen on bowstring truss bridges. The verticals are also rolled sections, and the cruciform-shape stock used for the outriggers is a feature associated with the WIBC. The bridge, which has been supported from underneath, is remarkably complete and is historically and technologically significant. It may well have significance on the national level given its transitional design, early date of construction, and completeness. This is an important bridge in the evolution of the pin connected metal truss bridge. It was previously typed as stringer bridge because of the underpinning placed in 1975. The WIBCo was established in 1866 by David Hammond, a Stark County carpenter who developed a patented bowstring truss design. WIBCo was noteworthy for its innovation and experimentation with a variety of metal-truss designs. It also built up a very successful network of salesmen and agents to represent the firm to local officials in Ohio and many other states and Canada, eventually becoming one of the largest fabricators in the nation before being absorbed into the American Bridge Co. monopoly in 1901.

Justification

The bridge has high significance as a transition from the technology of the bowstring truss to the Pratt pony truss. It has rare details.

Bridge Considered Historic By Survey: Yes

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