Brian S. Mast, JD

Brian S. Mast, JD

Brian S. Mast, JD

Brian Mast is the Director, Government Affairs and has been with the River Authority since the fall of 2007. His leadership includes developing, coordinating and implementing the River Authority’s local, state and federal legislative agendas and initiatives. He co-led the Westside Creek Ecosystem Restoration Feasibility Study, worked with the City of San Antonio to have San Antonio designated as the 19 th community in the EPA Urban Waters Federal Partnership and frequently works with the Texas Commission on Environmental Quality, Federal Emergency Management Agency, US Army Corps of Engineers and other federal and state agencies to advance the River Authority’s goals.

Brian received his B.A. from the University of Incarnate Word majoring in English and Philosophy. He served as a member of the first-ever group of U.S. Peace Corps Volunteers in independent Bangladesh. Following his Peace Corps service he attended Vermont Law School earning his Juris Doctorate and Master of Studies in Environmental Law.

Brian enjoys spending time in the mountains with his wife and daughter.

Alerts

Mission Reach Area Maintenance

Update (December 2025):
Crews will be moving south of Concepcion Park towards the baseball fields around the Mission Road area. The trail in this section will be closed the morning of Wednesday 12/10 and is expected to reopen the later next week. 

Work will also continue at the current location near mile marker 8.2 for the remainder of the week, where crews will be cleaning the area and hauling off chips and debris. This section of the trail will remain open

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.

Stem Density work 12.10.2025-12.19.2025

Trail Closure – Mission Reach Area

The Acequia Park trailhead entrance at Probandt Street to the Bexar County Public Works Department building’s trailhead will be closed through December 23rd due to construction. We apologize for the inconvenience.

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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