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. 

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. 

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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.

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Bacteria Dashboard

The River Authority tracks the bacteria Escherichia coli (E. coli) throughout the San Antonio River Watershed, and created this dashboard to display multiple visualizations of the most current monitoring station information.

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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.

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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.

                     

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.

Alerts

Park Closure Notice: Trueheart Ranch

Unfortunately, Trueheart Ranch Nature Park (14984 Blue Wing Rd, San Antonio, TX 78221) is closed until further notice due to recent vandalism. We’re working to assess and repair the damage to ensure the park is safe and welcoming for everyone. Thank you for your understanding—updates will be shared as soon as we have them.

Trail Closure: Museum Reach at Pearl

* Trail temporarily closed from 2/3/2025 until 5/16/2025. * For southbound pedestrian traffic, please exit the river and utilize the Hotel Emma bridge to gain access to the east side river trail. Access to the east side river trail via the elevator or stairs. * For northbound pedestrian traffic, please exit the river trail at the south bridge to gain access to the east side river trail. Continue north through Pearl towards Hotel Emma. The west & east side river trail accessible via the Hotel Emma bridge. North Bridge West Landing & Stairs Trail Closure Map  

Graytown Park Parking Lot Construction Notice 

Construction Timeline: April – October 2024 (estimated) Improvements are coming to Graytown Park! Parking lot construction will begin in April, and we appreciate your patience as we work to enhance the park for all visitors. Temporary Closures & Impacts:
  • Upper parking area, pavilion, and restrooms will be CLOSED during construction. Temporary restroom facilities will be provided.
  • Park and river access will be CLOSED Monday–Friday from 8 AM – 5 PM (no access during these hours).
We encourage visitors to plan accordingly and check back for updates as the project progresses. Thank you for your support! Stay Updated: Follow us on social media for the latest updates.

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.

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.

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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