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Highways, Byways, And Bridge Photography
Quinsippi Island Bridge
Quinsippi Island Road Mississippi River Crossing At Quincy
Quincy, Illinois

Quinsippi Island Bridge

• Structure ID:
• Location: River Mile 327.9.
• River Elevation: 470 Feet.
• Highway: Quinsippi Island Road.
• Daily Traffic Count:
• Bridge Type: Steel Plate Deck.
• Length: 650 Feet Overall, 100 Foot Longest Span.
• Width: 1 Lane.
• Navigation Channel Width: 80 Feet.
• Height Above Water: 10 Feet.
• Date Built: Built 1899 As Railroad Bridge.
The first bridge built at this location was an 1868 swingspan. That bridge was rebuilt in 1899 as a fixed steel plate girder bridge. In 1960, the railroad crossing at Quincy was rebuilt on a new alignment. This bridge, and the railroad owned land on Quinsippi Island, were turned over to Adams County to be used as a park. At that time, a narrow gauge tourist railroad was set up, which ran until 1984. At some point after 1984, the rails were removed and the bridge was modified to be used exclusively for vehicle traffic.

One interesting feature of this bridge is the mixture of stone and wooden bridge piers. The original swing bridge used the stone piers. When the swing span was removed, two wooden piers were installed to support the plate girders as they crossed the long spans where the swing span was formerly located. A second interesting feature of this bridge are the stone abutments at each end. Each has a round barrel-shaped culvert through the stonework.

Quinsippi Island Bridge

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Authored by John A. Weeks III, Copyright © 1996—2016, all rights reserved.
For further information, contact: john@johnweeks.com