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Alligator River Bridge



Alligator River Bridge

North Carolina.

Photo taken by Douglas Butler in April 2013


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Street View 


Construction on the nearly 2.8-mile-long Lindsay Warren Bridge on US 64 over the Alligator River began in 1960 and was completed in 1962. Its single swing span is technologically significant as one of the first three, long-span applications of welded girders in North Carolina and as a major project and design of the State Highway Commission. (The entries for the two earlier, long-span, welded bridges in the state-Rowan County Bridge 3 (1960) and Wilkes County Bridge 68 (1960)-include further information on the history of welding technology.) The early application of welding to a swing span is significant, for movable bridges are inherently complex structures and the movable span must be designed to sustain loads both in its closed and open configurations. The 263-foot length of the bridge's through-plate-girder swing span in the face of the engineering challenges was an impressive achievement by the state's engineers.

...The bridge has 341 spans that extend for a total of 14,928 feet. All of these but one are prestressed concrete stringer spans that vary in length from about 50 to 70 feet. Each has four lines of beams with concrete diaphragms between and a concrete deck above. Reinforced concrete bents support these spans. The single welded central swing span, set over the main marine channel, has plate girders that taper down from its central pier. It is the only example of a rim-bearing swing-span bridge included in the inventory. This design was used less commonly than the center-bearing design, which swings on a pivot. Rim-bearing spans have a circular girder called a drum that moves on rollers, which in turn follow a track atop the pivot pier. This system can more readily move wide, heavy loads. Like the lighter center-bearing movable spans in the inventory, however, this rim-bearing span is engaged by a rack and pinion drive system powered by electric motors and direct-drive shafts and gears. The substantial through girder of the span consists of a pair of welded-plate-girders with bolted splice plates, welded floorbeams, rolled stringers, angle cross-bracing, and a concrete-filled steel deck. At the southwest corner of the swing span stands a two-story, flat-roofed, operator's house, which is supported on extensions to the bents of the adjacent span. Now more than 50 years old, the bridge appears to be complete."-NCDOT


Swing bridge over Alligator River on US 64
Tyrrell County, North Carolina, and Dare County, North Carolina
Open to traffic
Built 1960
Pony plate girder swing
Length of largest span: 130.9 ft.
Total length: 14,928.9 ft. (2.8 mi.)
Deck width: 25.9 ft.
Also called
Lindsay C. Warren Bridge
Approximate latitude, longitude
+35.89990, -76.00196   (decimal degrees)
35°53'60" N, 76°00'07" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/410230/3973036 (zone/easting/northing)
Quadrangle map:
Fort Landing
Inventory numbers
NC 1770007 (North Carolina bridge number)
BH 23331 (Bridgehunter.com ID)
Inspection (as of 08/2012)
Deck condition rating: Poor (4 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Poor (4 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 4.0 (out of 100)
Average daily traffic (as of 2011)

Update Log 

  • August 11, 2015: Updated by Royce and Bobette Haley: AKA-Decription
  • November 4, 2013: New photo from Douglas Butler
  • October 29, 2013: New photo from Douglas Butler
  • March 11, 2010: Updated by Matthew Ridpath: Added Street View


  • Matthew Ridpath
  • Douglas Butler
  • Royce and Bobette Haley - roycehaley111 [at] yahoo [dot] com


Alligator River Bridge
Posted April 11, 2013, by Ethan (etmcdowell1 [at] yahoo [dot] com)

Bridge is currently closed for replacement of center pivot, gears, and balance wheels. See www.ncdot.gov for more info