Location: Tesson Ferry Rd and I-270, Concord, St. Louis Cty Reassurance shield after the I-270 junction. Location: Tesson Ferry Rd and Wells Rd, St. Louis Cty Reassurance shield about a mile later. Location: Tesson Ferry Rd and Route 141, St Louis Cty As we cross the Meramec River, we’ll approach Route 141. Location: Route 21 … Continue reading Missouri Route 21, I-270 to MO-141