French rivers thermal data are now available at : https://thermie-rivieres.inrae.fr/
Great work by Florentina Moatar , Aurélien Beaufort and Clotaire Catalogne.
https://www.zabr.assograie.org/wp-content/uploads/2021/04/zabr-fiche-donneesthermiespatiale.pdf
https://www.zabr.assograie.org/wp-content/uploads/2021/04/zabr-fiche-donneesthermietemporelle.pdf
TIGRE project