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7th Street Improvement Arches

7th Street Bridge

   


7th Street Improvement Arches

Primary Photographer(s): Nathan Holth

Bridge Documented: June 3, 2013
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Key Facts

Facility Carried / Feature Intersected
7th Street Over Railroad (Bruce Vento Rail-Trail)
Location
St. Paul: Ramsey County, Minnesota
Structure Type
Stone Semicircular Deck Arch, Fixed
Construction Date and Builder / Engineer
1884 By Builder/Contractor: McArthur Brothers of Chicago, Illinois and Engineer/Design: William Albert Truesdell

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
37 Feet (11.3 Meters)
Structure Length
90 Feet (27.4 Meters)
Roadway Width
Not Available
Spans
2 Main Span(s)
NBI Number
90386

Historic Significance Rating (HSR)

Bridge Documentation

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

View The National Register of Historic Places Nomination Form For This Historic Bridge

View The State Context For Masonry Bridges

View Detailed Historical Articles Discussing This Bridge and Its Designer

View A Short Historical Article Discussing This Bridge

This bridge is a rare example, and the only known example in Minnesota, of a skewed stone arch bridge that follows the helicoidal method for producing the skewed arch bridge. This method was common on bridges in England, but not in the United States. In fact, skewed stone arch bridges of any type are exceedingly rare, and many of those that are skewed use a structurally inferior ribbed design method. Consult the above historical articles and National Register nomination for a detailed discussion on this skew, the form it take, and its reasons for use. In short, the skew helicoidal design of skew allows for the stones to be cut of consistent design and as such allowed United States stone masons who were not used to cutting more complex shapes of stone to construct the needed masonry. At the same time, the design avoids the structural inadequacies of a ribbed approach to producing a bridge skew. Adding to the bridge's complicated design is that its two spans are not the same length, and the bridge also was constructed with a grade. The bridge was designed by William Albert Truesdell. The contractors for the bridge included M. O'Brien of St. Paul who constructed the substructure, specifically that up to the spring line. The rest was built by the McArthur Brothers of Chicago, Illinois. The bridge was originally built as a grade separation to carry 7th Street over the St. Paul and Duluth Railroad. Today, it crosses a rail-trail, the railroad line having been abandoned. The historic integrity of the stone arch bridge is outstanding with no major alterations noted. With the rail-trail underneath, visitors can easily view the spiral pattern of stones in the barrel of the arch, testimony to the helicoidal skew design.

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