The Stroudwater was originally constructed for Severn Trows, and the Thames and Severn for Thames barges, although the T&S locks were later shortened to save water.
The original channel dimensions were around 12M wide and 1.5M deep, and the Project Atlas states that the restoration aims to recreate "similar" dimensions.
I don't think that this section has been dredged yet.
More information at the link below:
Ignore that project Atlas link, that was what was intended when BW were involved.
The channel below the bridge was semi-dredged a few years back but not to the max width so that will be done when the bridge works are complete.
As for dimensions, the minimum lock width along the whole route is 12 ft. As the section above Wallbridge lower lock needed to be quite narrow due to land and building constraints, the new channel was designed with a max width of craft using the restored canal as being 12ft. Although theoretically you could get a 16ft wide boat up to Stroud, the way the channel has changed and has been encroached over the years means that realistically the max size of boat able to use the complete route would be 68ft x 12ft. 70ft narrow boats would not have any issue although they take a bit of jiggling around to get the gates open in a Stroudwater lock (I know from experience).
Edited to add:
The canal width around the bend is a lot better :
The bit you're looking at on the camera: