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San Antonio River Mission Reach Betterments | San Antonio, TX

Project Description:

This San Antonio River Mission Reach Betterments Project consisted of an eight mile stretch of the San Antonio River. Improvements along the Mission Reach focused on ecosystem restoration, flood control, reducing erosion, re-introducing native vegetation, re-constructing low-water crossings and creating an environment more suitable for recreation and wildlife.


Hike and Bike Trails – The Hike and Bike trails, pavilions and pedestrian bridges were designed to meet ADA, TDLR and DOJ criteria. GD designed the Trail plan and profiles in accordance with AASHTO, the City of San Antonio and Corps of Engineers (COE) criteria. Directional and interpretive signage was established along with bicycle racks, picnic tables, drinking fountains and trash receptacles. All structures were protected with special paint to assist with the easy removal of graffiti. GD coordinated closely with TxDOT during the design of the trail and retaining wall structures extending beneath the IH-10 and SW Military bridges.

Mission Parkway Avenue - GD was tasked to prepare options for raising an existing low-water crossing an additional 7ft from its current height which allowed for a FEMA 100yr storm event conveyance beneath the crossing. GD’s design tasks included trail plan and profiles, bridge class culverts, roadway plan and profile, grading/drainage plan, construction phasing, detour layouts, hydraulic analysis of bridge class culverts, utility relocation analysis, construction specifications and cost estimates. GD received approval and notice to proceed with the recommended construction option and resumed with preparing the plans, specifications, and estimates (PS&E) for 40%, 70%, 95% and 100% design phases and construction administration.

Concepción Creek - A tributary of the San Antonio River, GD designed scour protection pools along the creek’s bottom, including retaining wall plan and profiles and a pedestrian overpass bridge. The pools ensured that the creek’s existing hydraulic jump was dissipated enough to avoid interfering with the creek’s proposed pedestrian overpass bridge. GD coordinated with the COE, Bexar County and the City of San Antonio during their hydraulic and hydrologic analyzations to ensure water surface elevations were maintained. GD coordinated with various utility organizations including SAWS, CPS Energy and AT&T to discuss conflicts with proposed drainage structures.

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