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2490785 
Journal Article 
Water quality of the San Marcos River 
Groeger, AW; Brown, PF; Tietjen, TE; Kelsey, TC 
1997 
1 
Texas Journal of Science
ISSN: 0040-4403 
49 
4 
279-294 
WOS:000071190400002 
The San Marcos River exhibits a distinct pattern of changing chemical and physical characteristics as it runs its 133 km course to the confluence with the Guadalupe River. This evolution of water quality includes a shift from a primary influence of groundwater to a more runoff-dominated river ecosystem, anthropogenic influences of point and nonpoint pollution, and change in character as the river flows through different physiographic regions. The river is of a constant nature and has very high water quality in its headwaters, however it becomes a more variable, turbid lowland river closer to its confluence with the Guadalupe River.