Upper San Marcos River Watershed Protection Plan
The headwaters of the Upper San Marcos River around Spring Lake are fed by springs from the Edwards Aquifer. The Upper San Marcos River is on the TCEQ 2010 303(d) List as impaired for elevated total dissolved solids (TDS). Development and changing land uses are presenting new pressures and additional water quality concerns related to bacteria, nutrients, and sediment.
This project is developing a WPP for the Upper San Marcos River watershed to address the TDS impairment and the additional water quality concerns. Texas State University-Meadows Center will calculate a nutrient budget for Spring Lake to determine the nutrient load contributed by each of the major sources flowing into the lake. The Upper San Marcos coordination group is helping stakeholders develop a WPP, using this information, plus existing water quality monitoring data and land use information.