M5 Motorway obstruction
Although approximately on the old canal line, the underpass in the top photo has nothing to do with the canal, being built for livestock to cross under the motorway.
The restored canal will very likely follow a revised route that will share the River Frome bridge under the M5 (see second photo). The canal will be in a separate channel.
All views towards Saul.
Map reference for position of proposed new route is SO 7758 0647.