About 3,000 people including local authorities gathered on the 850-metre bridge in Nong Lu subdistrict of Sangkhla Buri district at about 7am to give alms to Buddhist monks amid morning fog.
The bridge, the longest one of its kind in Thailand, was packed with people who were celebrating its reopening after a runoff had torn it apart on July 28 last year.
The Kanchanaburi provincial hall earlier awarded a 16.35-million-baht contract to Por Rungruang Watsaduphan Co to repair the bridge within 120 days or by Aug 6. But the contractor failed to finish the job even on Sept 4.
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The 9th Infantry Division and local Thai people of the Mon origin then took over the task. The last plank and nail of the bridge were ceremonially hammered on Oct 4 after 36 days of cooperation.