Protection from Future Floods: River Authority Dam Management

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Walker Ranch Dam in Bexar County.

Walker Ranch Dam, Bexar County.

The history of flooding in our area has demonstrated the need to provide protection from future flooding events. As part of our commitment to safe, clean, and enjoyable creeks and rivers, the San Antonio River Authority (River Authority) employs a comprehensive approach to flood mitigation. Part of this approach includes the ongoing maintenance of flood retention dams throughout the San Antonio River Basin.

Many of these dams sit on properties that also serve as nature-based parks and the significant benefits provided by the dams for enhancing flood safety and protection are sometimes understated. Want to learn more about where these dams are and how they work? Follow along as we share more!

How many dams does the River Authority maintain in the San Antonio River Basin?

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The River Authority operates and maintains a total of 41 flood water retention dams throughout the San Antonio River Basin. There are 28 dams in Bexar County and the upper reaches of the Salado Creek has the largest system with 14 dams. The remaining 13 dams are in Karnes County.

Since the early 1950s, the River Authority has partnered with county, special districts, and federal entities for the development of these dams with most built in the 1960s and 1970s. These dams mitigate flooding in populated areas and are designed to withstand up to 44 inches of rain over a 24-hour period. In 2003, the McAllister Park Dam on the Salado Creek in Bexar County was the final dam completed.

How does the River Authority address flood risk mitigation?

Picture of Scientists working with maps and data to mitigate flooding.

In the River Authority’s model for flood risk management, protection refers to man-made structures that are designed to re-direct and manage the flow of water, diverting it from inundating neighborhoods where people and property are dense. The River Authority has a team of experts to properly maintain these dams on a routine basis.

Working together with other government organizations is a crucial component of effective flood risk management. By harnessing shared information, knowledge, and resources, communities can plan more effectively and efficiently.

How do I learn more about flooding and flood mitigation?

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Alerts

SASPAMCO Paddling Trail Temporarily Closed

Staff have removed two large log jams just downstream of Helton Nature Park, keeping the southern portion of the SASPAMCO Paddling Trail temporarily closed. Staff are working to contact adjacent landowners to support a land-based removal solution.

Stem Density Efforts

Please be advised that trails near the Confluence Park and Conception Park area will be temporarily closed due to ongoing Stem Density efforts. We appreciate your cooperation and ask that you remain mindful of workers and closures when in the vicinity. Thank you for your patience as we work to improve our natural spaces!

 

Gas Spill

The San Antonio River Authority and the City of San Antonio are actively working to contain a recent gas spill in the Downtown River Walk Loop area, which occurred earlier today. The source of the spill is unknown but has stopped. At this time, no environmental impacts have been observed, and teams are implementing measures to fully contain and remove the substance. We will provide updates as the situation develops.

West Bank Trail Closure Notice

Due to the construction of a new trail and bridge, the West Bank of the trail between Schiller St. and Newell St. will be closed for the next couple of months. The East Bank will also be intermittently closed on Monday, November 4th, to install the bridge. Please use caution when navigating around this area. We apologize for any inconvenience.

Please refer to the map for reference. 

San Pedro Creek Culture Park

The restrooms at South Alamo will be temporarily closed for maintenance and repairs. We apologize for any inconvenience and appreciate your understanding. 

Acequia Trail Notice

The Acequia trail will have heavy traffic near MROC starting May 22nd until further notice. The SAWS Acequia project will be bringing in crews to work on the lift station site and across the street. There will have flaggers to stop traffic, please use caution. 

SASPAMCO Paddling Trail

The SASPAMCO paddling trail is open from River Crossing Park to Helton Nature Park.
*Please Note: Paddling Trail from Helton Nature Park to HWY 97 is still closed due to blockages. 

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