Historic Bridges of the U.S. | Mill Rock Bridge

Overview

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Photos

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Downstream Elevation Showing Relationship Of Bridge To Surrounding Farms, Looking Sw

Photo by J. Ceronie, photographer, Bennett, Muessig & Associates, Ltd., Iowa City, IA, February 1983, for HAER

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East Approach, Looking W

Photo by J. Ceronie, photographer, Bennett, Muessig & Associates, Ltd., Iowa City, IA, February 1983, for HAER

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West Approach, Looking E

Photo by J. Ceronie, photographer, Bennett, Muessig & Associates, Ltd., Iowa City, IA, February 1983, for HAER

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Downstream Elevation, Looking S

Photo by J. Ceronie, photographer, Bennett, Muessig & Associates, Ltd., Iowa City, IA, February 1983, for HAER

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Upstream Elevation, Looking N

Photo by J. Ceronie, photographer, Bennett, Muessig & Associates, Ltd., Iowa City, IA, February 1983, for HAER

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Facts

Overview

Lost Pratt through truss bridge over Big Bear Creek on 33rd Avenue in Monmouth Township

Location

Monmouth Township, Jackson County, Iowa

Status

Replaced by new bridge

History

Built 1913; Replaced 1995

Builder

- Clinton Bridge & Iron Works of Clinton, Iowa

Design

Single span, six-panel summetrical Pratt through truss structure, with steel superstructure, riveted connections, concrete deck and concrete abutments.

"The Mill Rock Bridge was erected by Clinton Bridge & Iron Works, a major Iowa bridge contractor. It is locally significant as an early instance of the use of riveted connections and concrete deck in county bridge construction. These were among features which were to become standard in subsequent decades due to the establishment of the Iowa State Highway Commission and the Commission's enforcement of design standards for various kinds of crossings. Because the Mill Rock Bridge does not display all features associated with this standardization program, it may be considered an illustration of the transition from county to state control of local bridge design and construction.

"The Mill Rock Bridge was documented bu Bennett, Muessig & Associates, Ltd., Town City, Iowa, for the Board of Supervisors and County Engineer, Jackson County, Iowa, in 1983. The project team comprised of J. Ceronie, photographer; Matha B. Bowers, historian; and Bruce A. Hatms, photographic assistant."
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Dimensions

Total length: 101 ft.
Deck width: 14.6 ft.

Approximate latitude, longitude

+42.05556, -90.86111 (decimal degrees)
42°03'20" N, 90°51'40" W (degrees°minutes'seconds")

Approximate UTM coordinates

15/676987/4658157 (zone/easting/northing)

USGS topographic map

Baldwin, Iowa 15.678710.4658730

Inventory number

BH 37389 (Bridgehunter.com ID)