The Washington State Reformatory Unit (WSRU) opened in 1910. It is now part of what is referred to as the five-unit Monroe Correctional Complex (MCC). WSRU houses inmates with a "closed" custody designation or lower. In other words, though it is a closed-custody facility, some inmates qualify as medium-custody, or even long-term minimum custody. Inmates are housed in two large cellblocks, the A-B wing and C-D wing. Approximately 875 inmates are housed there at any given time.