The San Marcos gives us the unusual advantage of fishing a river just yards from its birthplace. The San Marcos River is formed by over 200 springs releasing 350 million gallons of water from the Balcones Escarpment each day. This unique arrangement gives us very stable water temperatures month after month in the headwater section of the San Marcos. The San Marcos holds large stocks of Largemouth and Smallmouth Bass, as well as an amazing population of Bluegill and Red Ear Sunfish up to and over a pound. The San Marcos also has a healthy population of Rio Grande Perch. If you have never caught one, this is the place to give it a try.