From “Old Cornish Bridges and Streams” by Charles Henderson, “Flatches or Fletchers Bridge over this stream (Cardinham Water) is insignificant.”
Now then, to be clear, he means architecturally insignificant. In social and economic terms it must be worth its weight in stone, blood, sweat and tears.
Pretty and pretty useful, as indeed are the feathered vanes or fletches which help arrows fly true.
To see pictures of my Harley in the river here just CLICK.