A Mercer County mile marker. WB IL St Rt 17 in New Windsor. A street sign in New Windsor. WB IL St Rt 17 west of Viola. WB IL St Rt 17/SB IL St Rt 94 in Aledo. WB IL St Rt 17 near Joy. WB IL St Rt 17 west of Joy. WB IL St Rt 17 north of New Boston. WB IL St Rt 17 in New Boston. The western end of IL St Rt 17. The western end marker. The road ends marker at the Mississippi River. A close-up of the sign above. This is the exact end of IL St Rt 17.