Casa Rio is a historic Mexican restaurant located on the San Antonio River Walk in San Antonio, Texas. Established in 1946 by Alfred F. Beyer, it holds the distinction of being the first business to open its doors on the River Walk. The restaurant is recognizable by its signature colorful umbrellas that line the riverside dining area, which have become an iconic symbol of the San Antonio River Walk. The restaurant specializes in traditional Tex-Mex cuisine and has maintained many of its original recipes since its founding. Casa Rio’s riverside location was originally part of the Spanish land grant of 1777. The building that houses the restaurant was constructed in 1930, preserving the Spanish colonial architectural style that characterized the area’s early development. Casa Rio is notable for pioneering riverfront dining in San Antonio and helping establish the River Walk as a major tourist destination. The restaurant introduced river barge dining in the 1950s, a concept that remains popular among visitors today. The establishment continues to operate as a family-owned business and serves as a significant landmark in San Antonio’s culinary and cultural heritage. Its location at 430 E. Commerce Street has made it a consistent draw for both tourists and locals seeking authentic Tex-Mex dining experiences.