Missouri State Route 104 is a winding highway through Washington State Park. MO St Rt 104 does not pass through any towns in Washington County. MO St Rt 104 is not multi-plexed in Washington County. MO St Rt 104 intersects the following highways in Washington County. Missouri State Route 21, near Blackwell. Missouri State Route 21, near Blackwell.
A junction marker on SB MO St Rt 21. A junction marker on SB MO St Rt 21. A guide marker on SB MO St Rt 21.
