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Alton Road Bridge

Crawford County Bridge 42, Mill Creek Bridge

Alton Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 28, 2019

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Key Facts

Facility Carried / Feature Intersected
CR-220 East (Alton Road) Over Mill Creek
Rural: Crawford County, Indiana: United States
Construction Date and Builder / Engineer
1885 By Builder/Contractor: Indianapolis Bridge Company of Indianapolis, Indiana

Technical Facts

Rehabilitation Date
Main Span Length
101 Feet (30.7 Meters)
Structure Length
104 Feet (31.7 Meters)
Roadway Width
13.5 Feet (4.11 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

This bridge's future is at risk!

Bridge Status: This historic bridge is at risk for demolition and replacement, despite a Select finding on the state management plan!

Despite some very crude welded repairs made to this bridge, it retains significance for its cast iron portal bracing details and association with a notable in-state builder. The bridge has some unusual cast iron connection and bearing details that are associated with Indianapolis Bridge Company. The bridge is listed as a Select bridge which in Indiana means it should not be demolished. However signage at the bridge suggests the county is seeking to bypass this regulation and demolish and replace the bridge. Sadly, there have been cases where counties and cities have gotten around Indiana's historic bridge management plan. It is a shame as this bridge deserves to have its bad repairs reversed and to be fully restored in a manner that is more becoming to the bridge's significance. 

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

View Historic American Engineering Record (HAER) Documentation For This Bridge

HAER Data Pages, PDF

Information and Findings From DHPA Historic Bridge Survey

Bridge History and Significance

The Indianapolis Bridge Company of Indianapolis, Indiana, fabricated this single-span, pin-connected Pratt through truss which is seated upon cut stone abutments and wingwalls. Intermediate verticals of crafted I-beams subdivide each truss into most of its eight panels. Eyebars provide the diagonals: adjustable pairs stretch toward center span from the top panel point to the bottom of the 2nd, 3rd, 6th, and 7th panels; cylindrical eyebars with turnbuckles cross the two most central panels. Adjustable cylindrical rods run horizontally (about midway between the chords) through the intermediate verticals. U-bolted to the lower pins, variable-depth girder floor-beams carry the timber deck and roadway which allows for 13 feet and 6 inches of vertical clearance. Built by a prolific Indiana firm, this bridge retains its original members, including its decoratively latticed portals and its decorative cast iron bracing. The crafting of its verticals from Ts and plates is also unusual. References AECON, Inc., Bridge Inventory and Inspection Report: Crawford County (Nashville, 1973). MW, Inc., Harrison County Bridge Inspection/Reinspection Report (Indianapolis, 1974, 1979). Simpson Engineering Corp., Bridge Reinspection Report: Crawford County (Indianapolis, 1980). WTH Engineering, Crawford County Bridge Reinspection Report (Indianapolis, 2001). bridge nameplate. Thomas Slade, ed., Historic American Buildings Survey in Indiana (Bloomington, 1983), 143.

Bridge Considered Historic By Survey: Yes


Photo Galleries and Videos: Alton Road Bridge

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