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Marion Center Road Bridge

Morton Bridge, Allen County Bridge 290

   
                  


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Bridge Documented: April 2, 2006 and September 21, 2012
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Key Facts
Bridge Name Facility Carried / Feature Intersected Location Structure Type Construction Date and Builder/Engineer
Marion Center Road Bridge
Morton Bridge, Allen County Bridge 290
Marion Center Road Over St. Marys River Rural: Allen County, Indiana Metal 14 Panel Pin-Connected Whipple Through Truss, Fixed 1880 By Builder/Contractor: Western Bridge Works of Fort Wayne, Indiana
Technical Facts
Rehabilitation Date Main Span Length Structure Length Roadway Width Main Spans NBI Number
2005 175 Feet (53.3 Meters) 176.8 Feet (53.9 Meters) 15.4 Feet (4.7 Meters) 1 0200216

Historic Significance Rating (HSR)

Primary Photographer(s): Nathan Holth and Rick McOmber

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

 This bridge is significant on a statewide basis as an example of a Whipple through truss, and also as a skewed pin-connected truss bridge. Pin-connected truss bridges do not often have a skew. The bridge is locally significant as the only remaining truss built by the in-county bridge builder, Western Bridge Works of Fort Wayne. This bridge features unusual turnbuckles that are only threaded at one end. Also, the rivets on the end post have unusually shaped heads on one end.

The bridge has been sensitively rehabilitated and it retains good historic integrity and good structural integrity.

Despite there being more Whipple trusses in Allen County (as of early 2006) than are in the whole of the state of Michigan, Whipple trusses are a less common, and significant structure type. As a skewed structure (20% skew) the bridge is even more significant. The bridge is also significant as an early surviving metal truss bridge, completed ca. 1880.

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

Allen County authorities selected noted local masons and an important local fabricator to build this bridge on an established public highway. The wrought iron superstructure may be the sole surviving example of the earliest Indiana metal-bridge fabricator. Whipple through-trusses are increasingly rare, and skewed ones are novel, indeed. The trusses retain their original members, including decoratively-latticed portals.

Architectural Description

Western Bridge separated the chords of this 175 ft., pin-connected, double-intersection Pratt (Whipple) through-truss span by 24 ft., subdivided the trusses into fourteen panels, and offset one truss from the other by 20 degrees. Rods hang as hip verticals. The intermediate ones consist of a pair of channels riveted together with plates to make an I beam which, in turn, is riveted to pin plates above and below. A pair of die-forged eyebars serve as diagonals in each panel except the three most central ones where a pair of cylindrical rods with turnbuckles double as diagonals and counters. Latticed portal struts, intermediate struts attached to the top chord above the upper panel points, and adjustable-rod lateral braces help to stabilize the high trusses. The bridge maintains 20 feet and 10 inches of vehicular clearance above the roadway. U-bolted to pins, the I floor-beams support I-beam stringers which together carry 16-ft timber roadway. Twentieth-century metal rails line the trusses.

Other Information

Michael J. Ross and more than a hundred other living in Marion township petitioned the Allen County Board of Commissioners in November 1879 for a bridge over the St. Mary's River on this established north-south public highway through the center of the township. In December, the Board ordered the Auditor to advertise for bids for construction of the "Morton Bridge," named for the largest adjacent property owner. Five companies presented proposals for Howe trusses, other timber-iron combinations, and wrought iron designs. After the county's surveyor, William H. Goshorn, reported on the "strain sheets" which the companies had submitted, the Board accepted the lowest wrought iron proposal--that of Charles L. Olds, "doing business under the name of Western Bridge Works of Fort Wayne," who bid $39 per lineal foot or $6,825. William Moellering and Henry C. Paul won the contract for stone abutments.

Bridge Considered Historic By Survey: Yes

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Photos and Videos: Marion Center Road Bridge

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