Gulph Creek Stone Arch Bridge - Delaware Department of ...

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Chapter 3—Historic Context for Common Historic Bridge Types River Bridge is somewhat unusual in that most bridges of this standard type were single span structures. Significance Assessment: Concrete girders possess moderate significance within the context of this study if they retain their character-defining features, which include a monolithic deck and girder system, parapet or railing when integrated (e.g., through girders) and abutments, and floorbeams, piers and wingwalls, when present. The most significant types of girder bridges are those that retain integrity and that can be identified as having been built according to the standard plans of the transportation departments in the first quarter of the twentieth century; those that were built very early in this type’s history—within the first decade of the twentieth century; and through girders, which are not common. The scenic qualities of some of these bridges, e.g., bridges that have decorative features such as railings or balustrades, may also elevate the significance of the bridge. Another type of girder that may have a relatively high level of significance within the girder type is one that can be identified as having been manufactured by one of the precast beam or structural component companies that began to proliferate when highway construction exploded following the Second World War. Examples of Reinforced Concrete Girders 1. Beaver Creek (Sandy River Overflow) Bridge (1912), Multnomah County; Oregon (determined eligible by SHPO). 2. Main Street-Black River Bridge (1923), Gogebic County, Michigan: (1999, Highway Bridges of Michigan MPS). 3. Monroe Street Bridge (1929), spanning River Raisin at Monroe Street, Monroe, Monroe County, MI, HAER MI-35. 4. Old US-131 Bridge (1929), spanning Big Cedar River, Mecosta vicinity, Mecosta County, MI, HAER MI-113. 5. Bridge No. 5083 (1931), Hwy. 19 over Redwood River, Lyon County, MN. NRHP Listed. Figures 3-73 and 3-74 depict a drawing and an example of a concrete girder. 3-94
Chapter 3—Historic Context for Common Historic Bridge Types Figure 3-73. Drawings of elevation and section of concrete girder. Adapted from Maryland State Roads Commission’s 1919 “Standard Girder Bridges General Plan.” Figure 3-74. Monroe Street Bridge (1929), spanning River Raisin, Monroe, Michigan. This multi-span structure is an example of a reinforced concrete girder. 3-74a. Elevation view. 3-74b. View of piers and underside of bridge. 3-95
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