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Alton Bridge

Crawford County Bridge 45

Alton Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 28, 2019

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Key Facts

Facility Carried / Feature Intersected
CR-1 (Alton-Fredonia Road, High Street) Over Little Blue River
Alton: Crawford County, Indiana: United States
Structure Type
Metal 8 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Metal 4 Panel Pin-Connected Pratt Full-Slope Pony Truss,
Construction Date and Builder / Engineer
1897 By Builder/Contractor: Lafayette Bridge Company of Lafayette, Indiana

Technical Facts

Rehabilitation Date
Main Span Length
140 Feet (42.7 Meters)
Structure Length
420 Feet (128 Meters)
Roadway Width
13 Feet (3.96 Meters)
1 Main Span(s) and 4 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This impressive bridge is noted for its length, and combination of through and pony truss spans. The original riveted bents under the approaches and riveted caissons for the main spans have been supplemented by modern steel bents. The truss spans have some alterations, some of which appear to predate the most recent repair work from 2009.

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

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

In October 1889, A. W. Peckinpaugh and John L. Hollcroft volunteered $500 "to assist in building bridge opposite the northeast end of Cherry Street in Peckinpaugh's Addition to the town of Alton." The dimensions of the proposed bridge were 150 feet in length with a 12-foot roadway. The notation mentions 50-foot approach spans also with 12-foot roadways; the auditor was ordered to advertise for bids. The record does not indicate what became of the bids, if any. Six years later there was a petition for a bridge "near the mouth of the Little Blue River" presented to the Board in September 1895. A contract, dated January 1897, was awarded to the Lafayette Bridge Company for the sum of $7,300.00 for a superstructure and a price of $4.75 per cubic yard for the masonry work. The dimensions given, it appears for all the spans, were 420 feet in length with a roadway width of 14 feet. - John Warner, M&H The five Pratt spans of this 410', pin-connected structure rest upon a series of metal piers and cut stone abutments and wingwalls. A 139'4" through span of eight panels is at the structure's core. Each of its intermediate verticals was made from a pair of laced channels, its diagonal sets from a pair of die-forged eyebars, and its counters (3 most central panels) of single, adjustable, and cylindrical rods. Replacement I floor-beams are U-bolted to the lower pins. The bridge carries a timber deck with a 14'10" roadway and 18 feet of vertical clearance. Four full-hip Pratt ponies--three to the west and one to the east--flank the through span. Each approach span extends 67'9" in four panels. The verticals of each truss are fabricated from two pairs of laced angles, their diagonals of a pair of die-forged eyebars, and the central panels' counters of single, adjustable, and cylindrical rods. New I floor-beams are U-bolted to the lower pins. Except for the full-hip design of the ponies, the trusses are rather conventionally made. The structure's length adds considerably to the bridge's significance. The substructure has been refurbished and the floor-beams & deck replaced. The main members of these undecorated trusses are, however, still original and functional. References AECON, Inc., Bridge Inventory and Inspection Report: Crawford County (Nashville, 1973). Simpson Engineering Corp., Bridge Reinspection Report: Crawford County (Indianapolis, 1980). WTH Engineering, Crawford County Bridge Reinspection Report (Indianapolis, 2001).

Bridge Considered Historic By Survey: Yes


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