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Twin Rivers

Boone, North Carolina

Stream Crossing


Landex, Inc.


NCDC Corporation


Landex, Inc.


November 18, 1999

This roadway bridge crosses an extremely environmentally sensitive trout stream to connect two parts of the Twin Rivers hiking and fishing residential/vacation development. Boone Fork Creek, which was critical not to disturb, had a winter construction moratorium from mid-October to mid-March.

To accommodate aesthetic design requirements, the CON/SPAN® wingwalls were mounted to the side of the end units as opposed to the front. The precast headwalls were set several inches back from the unit edge, leaving space for a (rock ledge) stone facing.

Working on a tight time schedule, footings for the structure were poured in place before the winter moratorium began in mid- October. At the same time, the precast modular units were manufactured off site and prepared for delivery.

The quick set-in-place installation gave Landex, Inc. the crossing they needed to run construction equipment between the two parts of the development and to continue construction through the winter months. The stream, which was monitored by the U.S. Army Corps of Engineers, was not disturbed nor did it need to be diverted. The cost for the CON/SPAN structure was approximately half of the original estimate for a conventional bridge.

Technical Description:

  • Span: 42 ft
  • Rise: 12 ft
  • Length: 30 ft

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