Hopefully, when funds are available, the causeway will be surfaced with asphalt, but as of now, it is two lanes wide, rough in spots but easily negotiable, even by cars tow ing camper trailers.
The man-made causeway has been my biggest worry in preparing the surface of Hakskeen Pan for Bloodhound.
The sarn forms a natural breakwater, and as the tide fell the extent of this natural "causeway" below the sea was visible from its influence on the surface of the water.
The remainder of the route is a four-lane undivided surface road called MacArthur Boulevard that runs from the causeway to U.S. Route 9.
There are also various crannogs on Islay, including sites in Loch Ardnave, Loch Ballygrant and Loch Allallaidh in the south east where a stone causeway leading out to two adjacent islands is visible beneath the surface of the water.
He's finished second twice: in 2000 with Giant's Causeway and in 2008, when the race was run on a synthetic surface with Henrythenavigator.
He has an impression of striding along a natural surface, along some coastal wilderness, on a smooth slab of basalt causeway he vaguely recalls from a childhood holiday.
When it does surface from its tunnel, most of what's visible is an elevated causeway.
The remnants of the old causeway, which used to run across the desert, are being re-graded to improve the surface still further.
The flow of the river has decreased in power in recent years, partly because of surface run-off in the upper catchment of the Hazel Brook, especially from the large retail centre at Cribbs Causeway, which sends a good deal of silt into the system, slowing the flow and creating a risk of flooding downstream.
