Hi Frank,
There's a decent bit of info in this thread which includes a KMZ file to follow.
https://www.caminodesantiago.me/com...o-rates-river-or-aqueduct.74203/#post-1037497
Basically there's two routes - the river route and the aqueduct route.
I followed the acqueduct route earlier this month using the KMZ file in the thread.
It was fine, quiet roads etc and only one part I didn't like because it was more or less a flooded mud track due to heavy rain. I've noted in the thread where that began and how to avoid it in wet weather.
Hope this helps
Phil