June 03, 2025
New Dam Nears Completion, Bringing Major Flood Relief to Round Rock
More than 1,000 homes near Lake Creek are set to benefit from a large-scale flood mitigation project nearing the finish line just outside Round Rock’s city limits.
A Long-Awaited Solution to Repeated Flooding
The new Dam 101, located east of O’Connor Drive and south of RM 620, is being built in an area that has repeatedly flooded during major storms—including in 2010 and 2015. Stretching nearly a mile long and four stories tall, the dam is designed to contain heavy storm runoff and reduce flood risk along more than five miles of Lake Creek.
Years of Planning, Backed by Voters
The effort stems from a watershed study launched by the Upper Brushy Creek Water Control and Improvement District (WCID) after Tropical Storm Hermine caused widespread damage in 2010. That study led to a regional Flood Protection Plan and an $85 million bond program, approved by voters in 2020, to fund a series of high-priority projects—including Dam 101.
Also funded through the bond: a smaller Dam 102 located nearby and upgrades to a quarry along RM 620, all part of a coordinated approach to watershed safety.
Collaboration Across Agencies
While the WCID has led the Dam 101 project, the City of Round Rock has contributed funding and helped with design support. Williamson County, the Texas Water Development Board, and community stakeholders have also played a role in shaping the plan.
What’s Next: Final Stages and FEMA Review
Construction on Dam 101 is expected to wrap up later this year. Once completed, the WCID will notify FEMA, which may reevaluate local floodplain maps—potentially leading to insurance savings for affected homeowners.
Updated August 23, 2026 to reflect substantive changes.
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