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.
Dartmoor visitor centre gets one last reprieve
But it will close in October unless cash can be found
Cornwall is key to Torbay's role in Devon devolution
'The two counties are natural partners'
Devon and Cornwall should combine under mayor, says Exeter MP
Steve Race supports city's unitary bid too
Plymouth supports South West Peninsula authority
Counties will get more working together, its claimed
Devon votes in favour of postponing May’s elections
Claims of democracy ‘denied’
Man jailed for life after stabbing strangers in Exeter
He boasted he had “livened up Exeter a bit”
