Detailed description and video here:

http://www.theriverguide.net/kayaking-Italy-Val+Sesia-Gronda

This section is also referred to as the Sermenzina. Here's a clip at med-low levels: https://vimeo.com/130790296

Detailed description, pictures and video here:

http://www.theriverguide.net/kayaking-Italy-Piedmont,+Val+Sesia-Lower+Mastallone

I think the water levels are a bit off. In my experience the gauge readings are not super reliable for this section. For example I paddled it once at 28cm and it was higher than another time I paddled it at 36cm. The ideal level is probably somewhere around 40cm. It probably still goes at much higher levels but I imagine it would become continuous grade V.

This section usually runs for most of April and May, and potentially June if there is a big snow pack. It can also run after heavy rains, although you need to get there within roughly 24 hours as levels rise and fall very quickly.

Detailed description, pictures and video here: http://www.theriverguide.net/kayaking-Italy-Val+d'Aosta-Ayasse+(Upper+Section)

More information here: http://www.eauxvives.org/fr/rivieres/voir/ayasse

Fantastic river. This section is much easier than the two sections below and is manageable for a solid class 4 team.

Detailed description and low-water video here:

http://www.theriverguide.net/kayaking-France-Departement+de+l'Ain-Semine

Detailed description and low-water video here:

http://www.theriverguide.net/kayaking-France-Department+de+l'Ain-Valserine