hi donna,
liverpool borough gaol was in great howard street,(the dock rd?) it was mainly used as a debtors prison,but after napoleons defeat, it was used to hold french prisoners of war. i'm not sure when it closed, but i guess about 1850,as walton prison took over around that time.i've not been able to find out much,on the net,but if you type in the name,you'll get a "herdman"print of what it looked like!
steve.