(Aquarena Springs, 37' x 10', 1970, 43-105-(a) across dry land in Aquarena Center (Texas State University - San Marcos) in San Marcos, Hays County, TX. Aquarena Springs Dr. W. 0.6 miles from jct with I35 exit 206 in San Marcos to the bridge on the N. side of the road. (9-20-07, N29 53.46 W97 55.77) Photos by Warren White.