Missouri Route 21

Route 21
Route 21
Tesson Ferry Road
Route information
	Maintained by MoDOT
Length	188 mi (303 km)
Existed	1922–present
Major junctions
South end	AR 115 at the Arkansas state line
	US 160 in Doniphan; US 60 near Van Buren; Route 72 in Centerville; Route 49 in Hogan; Route 32 in Caledonia; Route 47 in Mineral Point; Route M / Route MM in Barnhart; Route 141 in Paulina Hills; I-270 in Concord; US 50 / US 61 / US 67 in Concord;
North end	Route 30 in Affton
Location
Country	United States
State	Missouri
Counties	Ripley, Carter, Reynolds, Iron, Washington, Jefferson, St. Louis
Highway system
	Missouri State Highway System; Interstate; US; State; Supplemental;

Route 21 is a highway in eastern Missouri. Its northern terminus is at Route 30 in Affton. Its southern terminus is at the Arkansas-Missouri state line (where it continues as Highway 115). In the St. Louis area, it is known as Tesson Ferry Road, which was named after the 19th century proprietor of the ferry across the Meramec River. Route 21 from the Meramec River to Route B, along with Route M, make up the Jefferson County Scenic Byway.