Description The first of two Santiago Calatrave Bridges built in Dallas. The one arch and first is this, the Margaret Hunt Hill. The second is the Margaret McDermott Bridge with two arches crossing the Trinity on I-30 near downtown Dallas. Both city philanthropist are named Margaret so the bridges have been called Maggie 1 and Maggie ii. Maggie I with one arch built first and Maggie II with two arches that followed Maggie 1. Actually not only does it help identify the bridges with accuracy, its also easier to remember the Ladies full names with less confussion.