The Loire valley is pretty big, but it takes about an hour by train to get to the city of Tours and about the same by car to get to the city of Orléans.
France
1,013 kilometres (629.45 miles) and 1,012 kilometres (628.83 miles)
It varies enormously, but rarely exceeds 5 metres
I don't know about 'treillis' rivers, but the Loire river seems to me to be dendritic (in the sense of arborescent)