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Currie Parkway Bridge

Upper Bridge

   


Currie Parkway Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: 2006 and October 2, 2011
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Key Facts

Facility Carried / Feature Intersected
Currie Parkway Over Tittabawassee River
Location
Midland: Midland County, Michigan
Construction Date and Builder / Engineer
1908 By Builder/Contractor: Joliet Bridge and Iron Company of Joliet, Illinois

Technical Facts

Rehabilitation Date
1994
Main Span Length
140.8 Feet (42.9 Meters)
Structure Length
140.8 Feet (42.9 Meters)
Roadway Width
14 Feet (4.3 Meters)
Spans
1 Main Span(s)
NBI Number
565440600030B01

Historic Significance Rating (HSR)

Bridge Documentation

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

The Currie Parkway Bridge is an eight panel pin-connected truss bridge built by the Joliet Bridge and Iron Company, who built a number of truss bridges in Midland and Saginaw Counties.

This bridge has been recognized as a state historic site, and even has a full-size Michigan historic site interpretive plaque placed, something which only a few of Michigan's historic bridges have. Interpretive plaques are important because they help raise public awareness of the existence and importance of historic bridges.

This bridge was rehabilitated as part of preservation efforts in 1988. This makes it one of the earlier truss preservation projects in Michigan. This fact is apparent in the form of rehabilitation that took place on the bridge, which included adding a structural arch to support traffic loads, rendering the truss decorative (non-structural). Supplemental arches are one way to rehabilitate a historic bridge, although their use is generally considered a compromise preservation solution because while the added arch can increase the load capacity of the bridge and reduce project costs, the arch changes the appearance of the bridge significantly (the arch is hard to ignore when viewing the bridge), and also removes the function of the truss, since the arch is load-bearing. With the Currie Parkway Bridge, one unusual and invasive alteration was that the entire bottom chord connection assemblies were destroyed as part of the rehabilitation, and  the bottom chord eyebars were then welded directly to the vertical members about a foot higher. The diagonal members were also crudely welded to the vertical members. This is an unusual alteration that resulted in a significant loss of original bridge material and design, thus having an adverse affect on the historic integrity of the bridge. It is unclear why this was done, as it appears it should have been possible to add the arch without removing the bottom chord connections. If a compromise is being made to add the arch to increase the weight limit (thereby eliminating the need of the truss to bear loads), this should allow for the truss itself to be restored in-kind without alteration, balancing out the negative effect of installing the arch.

Despite severe alterations, the bridge remains an attractive historic bridge that traffic continues to flow over. The bridge actually carries a fairly high volume of traffic for a one-lane bridge, with an Average Daily Traffic of 4,550. Structurally, the bridge is sound, largely because its supporting arch is not old. However, the bridge has an extremely low 1% sufficiency rating, likely a reflection of its traffic volume and one-lane design. The addition of traffic-controlling stoplights at each end of the bridge would be one way to help address this problem. Another solution would be to construct a one-lane bridge parallel to the historic bridge to form a one-way couplet of bridges.

Information and Findings From Michigan Historic Sites Online

Narrative Description

The Upper Bridge is a single-span, 140 foot long, steel Pratt through truss with pinned eye-bar connections, and rests on concrete abutments. The bridge has a twelve-foot wide deck and latticed railings.

MARKER TEXT: THE UPPER BRIDGE When completed in 1908 the Upper Bridge, today known as the Currie Parkway Bridge, replaced its wooden predecessor as the main crossing over the Tittabawassee River. The Joliet Bridge and Iron Company of Illinois constructed the bridge for $7,500. It is a 140-foot-long steel Pratt through-truss bridge. In 1955 the Karl B. Robertson Bridge, built one-quarter mile to the south, succeeded the Upper Bridge as the city's main river crossing. In order to preserve the Upper Bridge, the city added an independent structural arch in 1988.

Statement of Significance

The Upper Bridge is a single-span, 140 foot long, steel Pratt through truss with pinned eye-bar connections, and rests on concrete abutments. The bridge has a twelve-foot wide deck and latticed railings.

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