Salmon fishermen have been building bridges to the island for over 270 years, though the structures have changed dramatically. In the 1970s, the bridge had only a single handrail and wide gaps between the slats -- the kind of crossing that sorted the committed from the cautious. The salmon came through these waters to spawn in the River Bann and the River Bush, and in the 1960s the fishermen were catching almost 300 fish per day. By 2002, the entire season yielded only 250. The fish have largely gone, victims of the same declines that have emptied salmon rivers across the British Isles. The fishermen no longer use the bridge during the season that once ran from June to September. What was once a working crossing has become one of Northern Ireland's most popular tourist attractions.

The island itself is a geological artifact of extraordinary violence. About sixty million years ago, molten rock punched its way through the chalk beds that underlie the Antrim plateau, leaving behind a volcanic pipe filled with dolerite -- a rock harder than the surrounding basalt. Behind the dolerite, the vent is packed with pyroclastic debris: tuff, explosion breccias, volcanic ash, and bomb fragments, evidence of eruptions that tore through the earth's crust with tremendous force. Over millions of years, the Atlantic waves went to work on the differential hardness of these rocks. The tough dolerite out front eroded slowly while the softer pyroclastic rock behind it broke down more quickly, and the sea gradually carved the headland into an island. Carrickarede is not just a scenic curiosity -- it is a textbook example of how volcanic geology shapes a coastline.

The current bridge was built in 2008 by Heyn Construction of Belfast, made from wire rope and Douglas fir, at a cost of over sixteen thousand pounds. It replaced an earlier structure from 2004, which had itself replaced one built with the help of local climbers and abseilers in 2000, tested to a load of ten tonnes. The National Trust, which owns and maintains the site, has kept the bridge open year-round since 2009, weather permitting, charging visitors between fourteen and fifteen pounds for the crossing. In May 2017, vandals damaged the bridge's structural ropes overnight, and the National Trust announced an indefinite closure. Structural engineers completed repairs within a day, and the bridge reopened -- a testament to how quickly the community and its custodians respond when something threatens this slender thread between mainland and island.

The Nobel laureate Seamus Heaney described the bridge in his 1978 poem "A Postcard from North Antrim": "A lone figure is waving / From the thin line of a bridge / Of ropes and slates, slung / Dangerously out between / The cliff-top and the pillar rock." Heaney captured something essential about the experience -- the smallness of the human figure against the scale of the coastline, the precariousness of the connection between one piece of land and another. Along this stretch of the Antrim coast, the cliffs are dark basalt over characteristic white Ulster chalk, the same geology that created the Giant's Causeway a few miles to the west. The rope bridge belongs to this landscape of extremes: ancient rock, restless sea, and the narrow, swaying path between them that people have been crossing for centuries -- whether for salmon, for the view, or simply to prove that they can.