The Science of Flood Management

Managing Our Flood Risk

Proper watershed management is the first step to lessening disastrous flooding.

Exactly what is a watershed?

It is all the land area that drains water into a common place, usually a river, stream or lake.  Weather events happening miles and miles away from these bodies of water can dramatically affect their levels, flow and intensity and cause severe flooding.   

Implementing appropriate management practices is important to sustaining and enriching life in the San Antonio River Watershed and control the devastating effects of flooding. The goal of the River Authority is to reach a sensible balance between physical, chemical, biological and economic factors while still maintaining the integrity of the watersheds throughout the San Antonio River Basin.

Because these factors are always evolving, an effective watershed management plan involves a never-ending cycle of planning, assessing, and implementing.

Here’s a closeup look at a Watershed Management Cycle:

Aerial view of flood waters held back by levee
Watershed Management Cycle

Collect water at specific locations and test to gather specific data.

Compare current water quality to state and federal standard or establish desired future conditions.

Develop goals and strategies to maintain or achieve water quality standards and meet future demands.

Implement goals and strategies through public policy, best management practives (BMPs) and education.

Determine the specific watershed and issues to be studied. Identity the stakeholders and resource personnel.

The River Authority constantly measures results to make sure the watershed management plan is performing at its highest level and adjust the program where needed.

Data Driven. Scientist Approved.

Another invaluable tool for flood control is a Watershed Master Plan.

It helps educate everyone about changes in land use, potential new building projects and modifications to regulations governing development within the basin. It’s particularly important as an information tool for decision makers whose actions and policies can affect the health of a watershed.

As the regional technical planning lead in watershed management, the San Antonio River Authority has made significant investments in collecting and maintaining watershed data and developing complex analytical tools and models to make scientifically sound watershed management recommendations.

City planners working with flood map

What's in Your Watershed?

The Watershed Master Plan Viewer displays information from the various Watershed Master Plan reports, as well as other useful reference data. This tool assists the stakeholders, decision-makers, and the public visualize and understand the challenges and potential solutions to watershed management. Explore your watershed using our Watershed Master Plan Viewer:

Alerts

Stay Weather‑Aware This Weekend

Stay Weather‑Aware This Weekend

Rain is expected across the region this weekend, which may result in high water on roads and temporary closures at low water crossings. Before heading out, residents are encouraged to check SARiverFlood.org or their local county flood website for real‑time roadway conditions: These sites provide up‑to‑date information from flood‑monitoring sensors across the region. Real‑time updates are available 24/7 to help you stay informed as conditions change. Please use caution when traveling and plan routes accordingly.

Restroom Closure Notice – Camino Coahuilteca (Acequia Park Trail)

  Restroom Closure Notice – Camino Coahuilteca (Acequia Park Trail) The restrooms at Camino Coahuilteca along the Acequia Park Trail will be temporarily closed on Thursday, April 16 due to parking lot improvements in the area. We encourage visitors to plan accordingly and utilize nearby facilities during this time. We appreciate your patience as we complete this work to enhance the park experience.  

Museum Reach – Oxbow Trail Closure Notice

The Oxbow Trail along the Museum Reach will be temporarily closed beginning Monday, April 13 through May 1 to accommodate project-related work in the area. For public safety, access to this section of the trail will be restricted during this time. Visitors are encouraged to plan accordingly and use alternate routes. Wayfinding signage and trail closure notices will be posted at designated locations to help guide trail users around the closure. We appreciate your patience and understanding as we complete this work to help maintain safe and enjoyable trail conditions.

San Pedro Creek Culture Park

The east bank trail along San Pedro Creek will be temporarily closed between the upper trail at Cameron St. and the lower trail at two access points. Closure details:
  • The first closure will impact the connector from the upper trail near West Houston St. to the south lower San Pedro Creek trail.
  • Once work at this location is complete and the trail reopens, construction will shift to the second closure area between the upper and lower trails on the opposite side of the green space.
Please follow posted signage and plan alternate routes. We appreciate your patience as this work is completed. Closed areas around San Pedro Creek Culture Park

The Brackenridge Trail

Trail Lighting Notice – Brackenridge Park Trail Due to an electrical issue, lighting is currently out along the north portion of the trail, from the Josephine Street inlet to just past Highway 281 within the Brackenridge Park Trail. Our team is actively working to correct the issue and expects repairs to be completed by the end of business tomorrow. We apologize for any inconvenience this may cause and appreciate your patience as we work to restore lighting. Please use caution when traveling through this area, especially during evening hours.

Trail Closure Alert – Calder Alley, San Pedro Creek

Maintenance work will be done in Calder Alley starting Wednesday, September 18, 2025.
  • Trails will remain open during this work.
  • One bench at a time will be temporarily barricaded while improvements are completed.
  • There may be occasional contractor pickups in the area.
We appreciate your patience as we continue to maintain and improve San Pedro Creek for all to enjoy!

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. 

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.

Goliad Paddling Trail Alert

NOTICE: HWY 59 Landing Site Closed Due to TxDOT construction on the HWY 59 Bridge, the HWY 59 landing site is closed until further notice. However, the Goliad Paddling Trail remains open, and paddlers can still access the river at the Riverdale, Ferry Street, and Goliad State Park landings. Please plan accordingly and check back for updates.

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