L.A. Gates Company - Logan Bridge No. 1

Description: The new Logan Bridges are a part of four new bridges for the town of Logan, WestVirginia. These side by side bridges are to carry WV Route 10 over the Guyandotte River along a new alignment.

Superstructure: Both bridges have 7 spans with spans varying from 140 to 180. The total length of the North Bridge is 1095 and the South Bridge 1165. Each bridge is 34-6 wide with a standard type F crash barrier on the outside and a higher median barrier on the inside. The deck on each bridge is supported by four continuous weathering steel girders with 75 webs. HPS70W steel was used in the flanges over the piers. Each bridge is independent of the other.

Substructure: Both bridges share one large abutment at the East end of the bridges. It is supported by a spread footing. Due to a curve in the river, the South Bridge is longer than the North, and they have separate abutments supported on piles at the west end. The piers are single column hammerhead type piers. Each column is supported by a single drilled shaft.

Special Considerations:

The east end of the bridges span over a landslide area that was discovered by the geotechnical engineer. The bridges were lengthened to accommodate this unexpected finding.
One of the west end abutments lies partially over an existing water intake structure. Because of this, special consideration was given to the layout of the abutment footing and the construction of the abutment.