near New Braunfels, Texas.
Discovered March 27, 1960, by four students of St. Mary's University, San Antonio. Named for the rock bridge that marks entrance. Dedicated on August 5, 1964 by Governor John Connally. Of Early Cretaceous age; still forming. . . .

(Bridges & Viaducts • Education • Exploration • Parks & Recreational Areas) Includes complete text, location, directions, 2 photos, GPS coordinates, map.