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City water department workers run the machines that weigh and mix lime and iron sulfate for treating raw river water at the Chain of Rocks water works. The "Chain of Rocks" is a series of rock ledges on the river bottom. In times of low water, many boats couldn't pass through the chain's bubbling current until completion of the by-passing Chain of Rocks Canal and Granite City Lock 27 in 1953. (Post-Dispatch)
Caption: City water department workers run the machines that weigh and mix lime and iron sulfate for treating raw river water at the Chain of Rocks water works. The "Chain of Rocks" is a series of rock ledges on the river bottom. In times of low water, many boats couldn't pass through the chain's bubbling current until completion of the by-passing Chain of Rocks Canal and Granite City Lock 27 in 1953. (Post-Dispatch) Album ID: 1199804 Photo ID: 34835712