CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins85% CONFIDENCEOverall confidence: 85%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Our China Story[1], Nature[3], the Three Gorges Probe fact sheet, Travel China Guide and Wikipedia[2] all date completion of the dam's concrete work to 20 May 2006.Workers poured the last concrete of the Three Gorges Dam wall on 20 May 2006, finishing the core structure of the world's biggest hydropower project on the Yangtze.