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San Antonio River Authority

Maps & Reports

The San Antonio River Authority is a long-time user and advocate of Geographic Information Science/Systems (GIS) technology and solutions and continually strives to enhance and promote GIS within the agency and community. Learn more about the GIS resources that are currently available from the San Antonio River Authority by exploring the viewers and information featured here.

Questions? Be sure to visit our Frequently Asked Questions section at the bottom of the page.

                     

Agency Interactive Viewers

Whether you are sitting at a desk or strolling along the River Walk, interactive GIS viewers are capable of displaying large amounts of data in an attractive, engaging, and user-friendly format. It’s easy to understand why they are a popular tool among GIS users of all skillsets! Learn more about the various projects and initiatives led by or involving the San Antonio River Authority by exploring the viewers featured below. 

Explore "Draft"

Floodplain Viewer

This application provides basic information about the various floodplains located throughout Bexar, Wilson, Karnes, and Goliad Counties. The data used in the application was collected by San Antonio River Authority and its partners. The ‘draft’ floodplains displayed are under FEMA review to be formally adopted. 

Floodplain Viewer

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Water Quality Viewer

The Water Quality Viewer displays the monitoring efforts for the Texas Commission on Environmental Quality (TCEQ) Clean Rivers Program and summarizes how the water quality in the San Antonio River Basin compares to the Texas Surface Water Quality Standards (TSWQS) using the latest TCEQ Integrated Report assessment.

Water Quality Viewer

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Watershed Master Plan Viewer

The Watershed Master Plan (WSMP) Viewer displays data produced in the various Master Plan reports, as well as other useful reference data. It is intended to be used as a visualization tool to assist the public, stakeholders, and decision-makers in understanding both watershed issues and potential solutions.
Watershed Master Plan Viewer

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GIS Open Data

The San Antonio River Authority allows access and use of its data and maps as a public service. This Open Data website allows the public to download San Antonio River Authority’s maps and data. These maps and/or data are to be used for reference and/or informational purposes only and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. It does not represent an on-the-ground survey and represents only the approximate relative location of property boundaries.

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Frequently Asked Questions

                     

Other GIS Data Sources

For all information and GIS data related to floodplain and watershed management but not maintained by the San Antonio River Authority, please refer to the following local, regional, state, and national entities.

Local Organizations
City of San Antonio
Bexar County
San Antonio Water System
Regional Organizations
Edwards Aquifer Authority (EAA)
State Organizations
Texas Commission on Environmental Quality (TCEQ)
Texas Natural Resource Information System (TNRIS)
Texas Water Development Board (TPWD)
Texas General Land Office (Texas GLO)
National Organizations
Federal Emergency Management Agency (FEMA)
National Oceanic and Atmospheric Administration (NOAA)
United States Geologic Survey (USGS)

Alerts

The Brackenridge Trail

February 10, 2026
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.

Mission Reach Area Maintenance

February 6, 2026
*FEBRUARY 2026 UPDATE* Acequia Park Trailhead will be temporarily closed due to ongoing Stem Density work. The closure area includes the section south of Theo Avenue and Probandt Street, extending south to Mission Road. Currently, work is taking place only on the west bank. The east bank portion of the project has been completed. Trails will be reopened Thursday (02/05) through the weekend and will close again early Monday (02/09) morning. Ongoing work will take place from Monday mornings through late Thursday afternoons. We appreciate your patience as we complete this important work to maintain and improve the park area. When: Beginning October 20, 2025 through Spring 2026 What: Crews will be performing stem-density removal and related vegetation maintenance along sections of the Mission Reach to help manage flood risk and protect surrounding infrastructure. Some trails or segments may be closed temporarily while work is underway. Why: Removing excess stems that naturally establish along the river helps maintain stormwater conveyance, reduces flood risk, and protects public infrastructure while allowing grassland and native vegetation to recover and thrive. What to expect:
  • Limited trail closures and intermittent work zones.
  • Crews and equipment working near the riverbanks during daytime hours.
  • Parking areas remain open, but visitors may see signage and temporary barriers.
Questions? Call the San Antonio River Authority at (210) 227-1373 or visit https://www.sariverauthority.org/services/river-health/ecosystems/. Thank you for your patience while we keep the Mission Reach safe, clean, and enjoyable. Mission Reach Trail Closure 2.3.2026  

Trail Closure Alert – Calder Alley, San Pedro Creek

September 12, 2025
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

June 30, 2025
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

June 30, 2025
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

June 30, 2025
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.
Current Conditions

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