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LCRA set to replace floodgates at Tom Miller Dam

August 16, 2018 - 2:14 pm

AUSTIN (KJCE) -- Tom Miller Dam in Central Austin will see an extensive renovation and replacement of its nine floodgates, officials announced Thursday.

The Lower Colorado River Authority, which operates and maintains the dam that creates Lake Austin, says the $9.9 million project is expected to take 18 months to complete.

The floodgates were installed during construction of the dam in the late 1930s, and the project marks the second extensive renovation of the dam since its completion in 1940. LCRA completed major structural improvements to the dam in 2005 as part of a dam modernization project.

"The dam is in excellent condition, but it's almost 80 years old,'' said John Hofmann, LCRA executive vice president of Water. "This project will replace the aging floodgates with new, custom-built floodgates that will help ensure the dam will continue to perform reliably and safely for generations to come."

During the project, LCRA will replace one floodgate at a time. Work on each floodgate will take about six weeks. The dam will remain in service and available to respond to floods and water supply needs throughout the project.

"We need to keep the dam operational, and that was a key factor in developing plans for this project," Hofmann said. "We're in Flash Flood Alley, and we need to be able to react quickly to move floodwaters downstream at any time. Doing the work one floodgate at a time takes more time, but allows the dam to remain operational throughout the project."

Though Tom Miller Dam has nine floodgates, the most ever opened at any one time is five. This happened twice – during Tropical Storm Hermine in September 2010 and the Halloween flood in October 2013.

The project will involve the use of two barges – a large construction barge that will stay at the dam throughout the project and a smaller shuttle barge that will ferry the new floodgates and other equipment to the dam from behind LCRA's Jack Miller Building on Lake Austin Boulevard. The new floodgates will be fabricated and partially assembled in Michigan, then shipped to Austin via truck. They will be staged off-site until needed at the dam.

The steel in the original floodgates will be recycled. Each floodgate weighs between 40,000 and 55,000 pounds.

For more information on the project, visit

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