its fine. pick it up near castle combe. just north of the M4 and follow it right up to kemble. you can divert off left toward luckington etc. back around sherston to hook up on the fosse again. last night the ford at overton? or luckington? was 4ft high. there are also 2 river crossings on the fosse. both of these are fairly tame. the second (heading north) can get upto 3ft. but is generally ok.
where you wind down a slope toward the river, use the bridge. DO NOT be tempted to cross the river. its not part of the byway and the farmers will be watching, their just waiting to close it down. the zuk and enduro *unts have torn the place to **** in the last 12months, creating tracks either side of the river for 100m and up banks close by. ramblers/farmers are getting well ****ed. stick to the path and use the bridge.
any more on the fosse, jut let me know.
G