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.
Cornwall man handed warning for disturbing dolphins
He encouraged others to do the same
10-storey Exeter student accomodation block planned
Developer wants to demolish old JobCentre
Former nightclub could become student accommodation
180 studio apartments planned for Unit 1
North Devon drug dealer jailed
He used an encrypted app to carry out his business
Investigation launched into glasses theft
More than 30 pairs have been taken
Controversial mega site for 700 Exmouth homes approved
Residents 'gutted'
