The Vinalope River, spanned by a bridge here, supplies the water that is still carried to the horts in canals dug by the Moors.
The water in the Vinalope River is still crystal clear and cold. 
mnli hypothesis: The water in the Vinalope River is still crystal clear and cold.  premise: The Vinalope River, spanned by a bridge here, supplies the water that is still carried to the horts in canals dug by the Moors.