Mae'r bont yn rhychwantu aber dwfn y Ddau Gleddau sy'n rhannu Sir Benfro'n ddwy. Cafodd y bont ei chodi i ddarparu croesfan 24 awr y dydd, i gymryd lle'r fferi a arferai cysylltu trefi gogledd a de Sir Benfro. Teithiodd y car cyntaf dros y bont newydd ar 20 Mawrth 1974.
The structure spans the deep estuary of Milford Haven, which divides Pembrokeshire into 2 parts. Built to provide a 24-hour solution to the vehicular ferry traditionally used to connect the southern and the northern towns of Pembrokeshire, the first car used the new bridge on March 20th 1974.