Missouri Route 21

Last updated

MO-21.svg
Route 21
Tesson Ferry Road
Missouri Route 21
Route information
Maintained by MoDOT
Length188 mi (303 km)
Existed1922–present
Major junctions
South endArkansas 115.svg AR 115 at the Arkansas state line
Major intersections
North endMO-30.svg Route 30 in Affton
Location
Country United States
State Missouri
Counties Ripley, Carter, Reynolds, Iron, Washington, Jefferson, St. Louis
Highway system
MO-20.svg Route 20 MO-22.svg Route 22

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. [1] Route 21 from the Meramec River to Route B, along with Route M, make up the Jefferson County Scenic Byway. [2] [3]

Contents

Improvements

Intersection of Highway 21 and 110, Right outside of De Soto, Missouri Mo21nRoad-Mo110signs (26946894508).jpg
Intersection of Highway 21 and 110, Right outside of De Soto, Missouri

The section through northern Jefferson County, Missouri was considered dangerous. As a result, the road was rerouted and built to freeway standards. Construction to reroute the highway to just south of Hillsboro was completed on December 15, 2008 and Route 21 is currently freeway standard from Route 141 to Highway B. Plans to extend the freeway south to De Soto have been approved, but funds are lacking to complete this part of the project. [4]

Route description

Missouri Route 21 begins at the Arkansas state line, where it continues southward as Highway 115. As the highway enters Ripley County, it passes through the city of Doniphan, where it intersects US 160 and Route 142. Route 21 runs concurrent with US 160 for a short distance before separating east of Doniphan. [5]

Continuing northward, Route 21 enters Carter County, where it meets US 60 near Van Buren. The highway briefly overlaps with US 60 before diverging and heading northeast into Reynolds County. In Reynolds County, Route 21 passes through Ellington, where it intersects Route 72 and continues northward toward Iron County. [6]

Upon reaching Iron County, Route 21 enters Arcadia and Pilot Knob, where it intersects Route 221. The highway then continues northward, passing through Washington County and reaching Potosi, where it meets Route 8. Further north, Route 21 intersects Route 47 near Old Mines before entering Jefferson County. [7]

In Jefferson County, Route 21 passes through De Soto, where it intersects Route 110. The highway continues northward, reaching Barnhart, where it meets Route M and Route MM. As Route 21 enters the St. Louis metropolitan area, it becomes a major arterial road known as Tesson Ferry Road, and passes through Concord and intersecting I-270. The highway then reaches its northern terminus at Route 30 in Affton. [8]

Major intersections

CountyLocationmikmDestinationsNotes
Ripley 0.0000.000South plate.svg
Arkansas 115.svg
AR 115 south Pocahontas
Arkansas state line
8.57813.805West plate.svg
MO-142.svg
Route 142 west Gatewood
Southern end of Route 142 overlap
9.82515.812West plate.svg
US 160.svg
US 160 west Alton
Southern end of US 160 overlap
Doniphan 11.71418.852East plate.svg
MO-142.svg
Route 142 east – Business District
Northern end of Route 142 overlap
13.67722.011East plate.svg
US 160.svg
US 160 east Poplar Bluff
Northern end of US 160 overlap
Carter 36.03157.986East plate.svg
US 60.svg
US 60 east Poplar Bluff
Southern end of US 60 overlap
45.60873.399West plate.svg
US 60.svg
Begin plate.svg
MO-34.svg
US 60 west / Route 34 begins Van Buren
Northern end of US 60 overlap; Southern end of Route 34 overlap
Reynolds 48.95978.792East plate.svg
MO-34.svg
Route 34 east Clearwater Dam, Piedmont
Northern end of Route 34 overlap
Ellington 65.112104.788West plate.svg
MO-106.svg
Route 106 west Owls Bend, Eminence, Business District
77.088124.061West plate.svg
MO-72.svg
Route 72 west Bunker
Southern end of Route 72 overlap
85.027136.838North plate.svg
MO-49.svg
Route 49 north Black, Oates
Southern end of Route 49 overlap
Iron 98.252158.121South plate.svg
MO-49.svg
Route 49 south Annapolis
Northern end of Route 49 overlap
Arcadia 107.967173.756East plate.svg
MO-72.svg
Route 72 east
Northern end of Route 72 overlap
Pilot Knob 110.072177.144North plate.svg
MO-221.svg
Route 221 north
119.405192.164West plate.svg
MO-32.svg
Route 32 west
Southern end of Route 32 overlap
Washington Caledonia 123.672199.031East plate.svg
MO-32.svg
Route 32 east Bismarck
Northern end of Route 32 overlap
Potosi 135.913218.731MO-8.svg Route 8  Potosi, Leadwood
Old Mines 142.085228.664South plate.svg
MO-47.svg
Route 47 south Bonne Terre
Southern end of Route 47 overlap
147.011236.591North plate.svg
MO-47.svg
Route 47 north Richwoods
Northern end of Route 47 overlap
Washington State Park 149.523240.634East plate.svg
MO-104.svg
Route 104 east
150.912242.869West plate.svg
MO-104.svg
Route 104 west
Jefferson 161.379259.714East plate.svg
MO-110.svg
Route 110 east
Hillsboro 165.177265.827Begin plate.svg
MO-supp-B.svg
Route B begins / Business 21
Southern end of Route B overlap
165.547266.422North plate.svg
MO-supp-B.svg
Route B north
Northern end of Route B overlap; southern end of freeway
Hillsboro 167.854270.135MO-supp-A.svg Route A / Business 21
169.236272.359Hayden Road
172.575277.733Old Route 21 - Goldman
175.162281.896Old Route 21 / Schenk Road
Otto 177.733286.034MO-supp-MM.svgMO-supp-M.svg Route MM / Route M  House Springs, Barnhart
180.341290.231Old Route 21 - Shady Valley
184.555297.012Old Route 21 - Meramec Heights Southbound exit and northbound entrance
185.469298.483MO-141.svg Route 141  Fenton, Arnold Interchange; northern end of freeway
185.864299.119Meramec Bottom Road
St. Louis Concord 190.517306.607I-270.svg I-270  Chicago, Memphis I-270 exit 2
191.717308.539US 50.svgUS 61.svgUS 67.svg US 50  / US 61  / US 67 (Lindbergh Boulevard)
Affton 194.126312.416MO-30.svg Route 30 (Gravois Road)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Hillsboro Business Spur

Business plate.svg
MO-21.svg
Route 21 Business
Location Hillsboro, Jefferson County
1920s-era Missouri 21 marker MO-21 (1920).svg
1920s-era Missouri 21 marker

Business 21 follows the old alignment of Route 21 through the city of Hillsboro. It begins at the intersection of Route 21 and Highway B on the southern edge of the city, and continues north to the intersection of Route A and Old Route 21, where it ends. Business 21 is the only way one can now reach Route BB, as the rerouting of Route 21 bypasses the road.

See also

References

  1. Missouri Department of Transportation (2021). Official Highway Map (Map) (2021–2022 ed.). Jefferson City: Missouri Department of Transportation.
  2. "Scenic Byway Plan". Jefferson County, Missouri. Retrieved June 18, 2025.
  3. Jefferson County examines 'scenic byways' designation for routes 21 and M Archived 15 July 2012(Date mismatch) at archive.today
  4. "ROUTE 21 IMPROVEMENTS (ROUTE B TO DESOTO)". Missouri Department of Transportation. Retrieved July 25, 2021.
  5. Missouri Department of Transportation (2021). Official Highway Map (Map) (2021–2022 ed.). Jefferson City: Missouri Department of Transportation.
  6. Missouri Department of Transportation (2021). Official Highway Map (Map) (2021–2022 ed.). Jefferson City: Missouri Department of Transportation.
  7. Missouri Department of Transportation (2021). Official Highway Map (Map) (2021–2022 ed.). Jefferson City: Missouri Department of Transportation.
  8. Missouri Department of Transportation (2021). Official Highway Map (Map) (2021–2022 ed.). Jefferson City: Missouri Department of Transportation.

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