Route 21
Maintained by MoDOT
Length:	188 mi (303 km)
Formed:	1922
North end:	Route 30 in Affton
South end:	Highway 115 at the Arkansas state line
Missouri Highways < Route 20 Route 22 > Supplemental - Decommissioned

Route 21 is a highway in eastern Missouri. Its northern terminus is at Route 30 in Affton. Its southern terminus is at the Arkansas 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 nineteenth century proprietor of the ferry across the Meramec River. Missouri Department of Transportation (also refered to as MoDot) is in charge of maintaining public roadways of Missouri. ... A mile is a unit of length, usually used to measure distance, in a number of different systems, including Imperial units, United States customary units and Norwegian/Swedish mil. ... km redirects here. ... Image File history File links No higher resolution available. ... Route 30 is a highway in eastern Missouri. ... Affton is an unincorporated census-designated place located in St. ... Official language(s) English Capital Little Rock Largest city Little Rock Area  Ranked 29th  - Total 53,179 sq mi (137,002 km²)  - Width 239 miles (385 km)  - Length 261 miles (420 km)  - % water 2. ... Missouri 366 in St. ... Missouri Supplental Routes are officially designated as State Secondary Roads. They are roads within the state of Missouri designated with letters. ... This article does not adequately cite its references or sources. ... Route 30 is a highway in eastern Missouri. ... Affton is an unincorporated census-designated place located in St. ... Official language(s) English Capital Little Rock Largest city Little Rock Area  Ranked 29th  - Total 53,179 sq mi (137,002 km²)  - Width 239 miles (385 km)  - Length 261 miles (420 km)  - % water 2. ... The Meramec River Looking North from Route 66 State Park Canoers enjoy a float trip on the Meramec below Leasburg The Meramec River is the longest free-flowing waterway in Missouri -- it wanders some 350 kilometers (220 miles) through six Missouri Ozark Highland counties: Dent, Phelps, Crawford, Franklin, Jefferson, and...

The section through northern Jefferson County, Missouri was the site of numerous fatal traffic accidents due to the narrow road being unable to handle increased traffic from population growth, and was referred to as "Blood Alley" and "Missouri's Most Dangerous Highway" (and was featured in an Reader's Digest article on dangerous roads)^{[citation needed]}. As a result, the road was rerouted and built to freeway standards; it is currently freeway standard to just north of Hillsboro, Missouri and construction is underway to eventually re-route the road to just south of Hillsboro. Jefferson County is a county located in the U.S. state of Missouri, and included the mean center of U.S. population in 1980. ... This article or section does not adequately cite its references or sources. ... Interstate 80 (Eastshore Freeway) in Berkeley, a typical American freeway (MUTCD definition) A freeway is a type of highway that is designed for safer high-speed operation of motor vehicles through the elimination of at-grade intersections. ... Hillsboro is a city located in Jefferson County, Missouri. ...