sentences:  It is one of three dams on the Thames River and its tributaries.After repeated floods, the Upper Thames River Conservation Authority built the dam to control the level of the Thames River; construction began in 1950 and completed in 1952.It cost $5 million - Federal government 37.5%, Provincial government 37.5%, Upper Thames River Conservation Authority 25% (95% from City of London, Ontario, 5% from London Township).