The San Marcos River originates from San Marcos Springs, the location of Aquarena Springs in San Marcos, Texas. The springs are domestic to several threatened or endangered species, together with the Texas blind salamander, fountain darter, and Texas wild rice. The river is a famous undertaking area and is often visited for tubing, canoeing, swimming, and fishing.
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The river starts at San Marcos Springs, rising from the Edwards Aquifer into Spring Lake. Access to the maximum of the headwaters is restrained due to the delicate environment and many rare species. The Upper River flows via the San Marcos and is a famous activity place. It is joined by way of the Blanco River after four miles and passes via Luling and Palmetto State Parks. Near Gonzales, it flows into the Guadalupe River after a complete seventy-five miles (121 km). This course is the primary phase of the Texas Water Safari.
The records and nomenclature of the river are uncertain. It may additionally be located by Alonso de León’s day trip in 1689, but a few students believe he found the Colorado or Navidad rivers alternatively. The conference got here to call it the first predominant river beyond Guadalupe, however at the time, the Comal River become frequently called the Guadalupe, and the part of Guadalupe changed into frequently referred to as the San Gabon. In 1808, the Spanish-based San Marcos de Neve, which is positioned south of present-day San Marcos. He had friendly family members with the Tonkawa Indians, but the adverse Comanche tribe compelled him to leave in 1812. In 1998 and 2015, the river turned tormented by severe flooding.
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San Marcos hosts many activities on the San Marcos River. The Texas Water Safari Program has run each 12 months because 1963; It simplest uses a canoe powered using human muscle. The event makes use of the San Marcos River and the Guadalupe River, which extend from Aquarena Springs in San Marcos to Seadrift, Texas, for a complete distance of 260 miles. The event is certainly made up of several elements, along with a statistics seminar, a safari race, an initial race, and any other quick race. Racers ought to have sufficient meals and provisions to hold the distance of the race. The Texas Water Safari is billed as “the arena’s toughest boat race” and runs annually on the second one Saturday of June.
Another occasion is the once-a-year San Marcos River Cleanup of the San Marcos River, organized spring cleanup of the entire river. Volunteers can either ease up debris across the river using a canoe or prepare dinner for the San Marcos River Clean-Up Thank-You Dinner that is supplied for all volunteers. The annual cleanup is coordinated by using Tom Goons, president of the Texas River Protection Association, and is typically the first Saturday of every March. 
Flora And Fauna
There are many extraordinary natural world species in San Marcos, together with endangered ones, that live within the San Marcos River. Species are listed as endangered or endangered primarily based on declining numbers or habitat loss. The Texas Blind Salamander and San Marcos Salamander are endangered species found handiest inside the San Marcos River and elements of the Edwards Aquifer.
Other endangered species include the fountain darter and the San Marcos gambusia, which live in the San Marcos River. The fountain darter is characterized by a mottled brown body and dark markings that assist it camouflage underneath the banks of the San Marcos River. It has a growing populace and thrives within the San Marcos River. The San Marcos Gambusia is characterized by prominent darkish stripes alongside its body. Its population is unknown, as no specimens had been amassed because 1983, and it is also considered extinct. Both fish require clean, clear, continuously flowing water with a stable temperature.
An endangered plant species unique to the San Marcos River is Texas wild rice. There are still handiest 230 clumps left at the river in two separate populations, with one population being grown on the Texas State University campus. 
The San Marcos River is considered one of the most biologically numerous aquatic ecosystems known within the southwestern United States. As a result, the American Fish and Wildlife Service and the Texas Department of Parks and Wildlife have distinctive San Marcos Springs and Spring Lake as important habitats, so parts of the river had been privatized. Critical habitat refers to a selected geographic place that incorporates all the physical, chemical, and biological residences necessary for the continuing fulfillment of an endangered plant or animal and which may also require unique efforts for his or her control and conservation. 
Much of the San Marcos River is included via the Edwards Aquifer Habitat Conservation Plan, because of the wildlife that lives in or close to the river. The plan became hooked up in 2006 as an attempt among numerous Texas towns to use the many assets of the San Marcos River to control the aquatic habitats and water sources of Comal and San Marcos Springs. The plan allows control of non-native species, strong control of species, manipulation of local species, sediment elimination, pollution reduction, and flow conservation.  Edward Aquifero’s protection Work at the banks of the San Marcos River is the primary attention of recovery projects in a major attempt to