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The Olmos Dam in Texas, was built in 1927 as a direct result of the catastrophic September 1921 San Antonio floods.

It was updated by the City of San Antonio and the San Antonio River Authority in the 1970's, and '80's.

The Olmos dam has six gates, two of which are open at all times at two feet high. They are rotated once a week, each gate is controlled inside the dam's gatehouse via an actuator.

It has become a "staple structure north of downtown San Antonio."

Notable events
In 1998 a torrential rain resulting in devastating flooding that killed at least 25 people and caused hundreds of millions of dollars in damages across the Hill Country and in counties south and east of San Antonio, as well as in the July of 2002, flooding, in both cases the Olmos Dam mitigated the damage that could have resulted.

From the Encyclopedia of Texas in 2001: "Olmos Dam in San Antonio was one of the outstanding flood control measures."

San Antonio's Transportation & Capital Improvements Department assistant director Nefi Garza said: "Olmos Dam is a first-level of defense when it comes to flood control."