The N.C. Department of Transportation plans to
conduct a routine, annual scan of the bridge deck of the Bonner Bridge
over Oregon Inlet on Friday, May 20.
This will require road crews to halt traffic on
both ends of the Bonner Bridge, beginning at 9 a.m., for no longer than
30 minutes. This will allow crews from NCDOT’s Location and Surveys
Unit to conduct the annual scan. The bridge will reopen to
traffic at 9:30 a.m. immediately following the scan.
It is normal for a bridge to move, expand and
contract with weather. By performing this scan once a year, as well as
following hurricanes and other severe weather events, NCDOT is able to
monitor and evaluate any abnormal movement of the bridge.
The Bonner Bridge has a series of GPS data points
placed along the deck. During the scan, a truck with a GPS reader will
slowly travel along the bridge, turn around and travel back. While the
truck is traveling on the bridge, the reader will gather the location
data of each of the data points.
This data will then be compared to previous data
gathered last year to determine if there has been any abnormal movement
of the bridge.
In addition to routine annual deck scans, NCDOT
also performs monthly underwater sonar scans to monitor the bridge’s
support structure for signs of scour, where sand has drifted away from