In the Swim Houston & St. Mary's St.

A series of six major floods in seven years (1914-1921) prompted the city to take serious action. The flood of September 1921 covered most of downtown San Antonio in 2 to 10 feet of water, causing an estimated 50 people to lose their lives, destroying the majority of the city’s bridges and over $3 million dollars in property damage. In response, a flood control program resulted in the building of a dam in the Olmos Basin and the digging of channels to divert floodwaters away from the business and government districts.