Well, my mandate and authority are for federal corrections, but I do have the experience of visiting some provincial institutions, and I'm familiar with the literature on prison crowding.
Collectively I think it's fairly well understood that crowding prevents the best correctional practice from happening. No matter what the environment, a crowded jail leads to delays in programming access, treatment interventions, and assessments, and to increases in violence, dangerous environments for staff to work in, and the risk of the spread of infectious disease.
Really, those findings would apply to provincial jails as equally as they would apply to federal penitentiaries.