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CR-850 North Bridge

Bartholomew County Bridge 50

CR-850 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-850 North Over Duck Creek
Location
Rural: Bartholomew County, Indiana: United States
Structure Type
Concrete Through Girder, Fixed
Construction Date and Builder / Engineer
1915 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
31.2 Feet (9.51 Meters)
Structure Length
67 Feet (20.42 Meters)
Roadway Width
15.7 Feet (4.79 Meters)
Spans
2 Main Span(s)
NBI Number
300046

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge is a good example of a one-lane concrete through girder. Likely because of its relatively early 1915 construction date as well as its narrow, one-lane design, the bridge has surprisingly lightweight girders that do not look much more massive than one might expect with non-structural bridge railing found on other bridge types like a concrete t-beam bridge. The bridge has articulated floorbeams that are visible under the deck. The historic integrity of the bridge is very good.

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

From a structural perspective, the designer of this bridge produced rather standard through-girder spans. They are, though, unusually well decorated.

Architectural Description

Because of its greater rigidity, the reinforced concrete through girder can be extended beyond the T-beam's ordinary limit of span (40' - 60' long). In a through structure, a pair of girders - large beams that receive their loads from other beams - flank the roadway and usually carry the deck above floor beams (which run from girder to girder and whose reinforcing rods are interlocked with those of the girders). The through girder is preferred where the roadway is not far above stream level and T-beams could obstruct the watercourse more than would girders which do some of their carrying above the level of the road.

The girders of this two-span, 67' structure are about 4'3" high and 14" wide. Each set spans 33'6" and are decorated with a pair of panels and concrete coping. Transverse floor beams carry a concrete deck and a 16' asphalt roadway. The girders rest upon a concrete pier, abutments, and flared wingwalls.

Bridge Considered Historic By Survey: Yes

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