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CR-1225 North Bridge

Jennings County Bridge 50

   


CR-1225 North Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: September 22, 2012
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Key Facts

Facility Carried / Feature Intersected
CR-1225 North Over Flatrock Creek
Location
Rural: Jennings County, Indiana
Construction Date and Builder / Engineer
1895 By Builder/Contractor: Wrought Iron Bridge Company of Canton, Ohio

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
60 Feet (18.3 Meters)
Structure Length
62 Feet (18.9 Meters)
Roadway Width
15.7 Feet (4.8 Meters)
Spans
1 Main Span(s)
NBI Number
4000048

Historic Significance Rating (HSR)

Bridge Documentation

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

Some names we find in roads and rivers make little sense today. However, Flatrock Creek is appropriately named. The creek is lined with flat rocks as it passes under the bridge. Indeed, one very unusual aspect of this bridge is that it does not have built abutments and instead simply rests on the rock.

Although no plaque survives, this bridge appears to be the work of the Wrought Iron Bridge Company. The reason for this assessment is the cast iron bridge shoes with part numbers cast into them that accept a threaded rod with nut style connection for the bottom chord, combined with the use of pairs of rolled t's with lattice for the vertical members.

The bridge has some other noteworthy details. The floorbeams are built-up. Small, possibly cast iron wedge-shaped washers are found above the hanger bolts. The lateral bracing connections to the floor beams also include unusual cast iron washers.

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

Aside from the design of the verticals and the adjustability of all diagonals, the other members of this Pratt pony span are rather standard for an early pinned structure. The absence of a man-made substructure is noteworthy. The original members of the unadorned bridge still function.

Architectural Description

This single-span Pratt pony truss rests upon bedrock. It has no man-made substructure. The pin-connected structure extends 61'8" in five panels. Its verticals are fabricated from laced Ts. All the diagonals and counters are made from cylindrical rods and adjust. A pair of rods supply the outer diagonals; a single rod provides the diagonal and counter in the center panel. Girder floor beams, which are U-bolted to the lower pins, carry the concrete deck with its 15'10" roadway.

Bridge Considered Historic By Survey: Yes

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Photos and Videos: CR-1225 North Bridge

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