The jail was designed to hold 318 inmates but the Howard League for Penal Reform says at the end of January, there were 530.
The charity also says the overcrowding leads to more violence and self-harm among prisoners, and hampers their rehabilitation.
Festive fanatic launches 'one song' Christmas station
MattMas plays merry song mercilessly
'Russian spy' report leads to extra harbour training
Torbay harbour staff to receive more training
Lib Dems snap up another East Devon seat
They win Seaton by-election
Torbay robots programmed for hedgehog safety
Mowers are out during the day
Fire funding gap could hit £12m if council tax frozen
Documents show a range of funding deficits over five years
