Iowa Highway 21

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Iowa Highway 21

Iowa 21 highlighted in red
Route information
Maintained by Iowa DOT
Length97.152 mi[1] (156.351 km)
Major junctions
South end Iowa 149 near Hedrick
Major intersections
North end US 20 / Iowa 27 at Waterloo
CountryUnited States
Highway system
US 20 Iowa 22

Iowa Highway 21 (Iowa 21) is a state highway that runs from north to south in central Iowa. It has a length of 97 miles (156 km). Iowa 21 begins at Iowa 149 west of Hedrick and ends at a freeway interchange with U.S. Highway 20 (US 20) in Waterloo.

Route description

Iowa 21 begins one mile (1.6 km) west of Hedrick and goes north through Delta before intersecting Iowa 92. It proceeds through What Cheer before intersecting Iowa 22 west of Thornburg. It continues north to Deep River where it intersects Iowa 85. After passing through Guernsey, it then intersects Interstate 80, then meets US 6. It overlaps with U.S. 6 going eastward, then turns north near Victor. It then intersects Iowa 212 before entering Belle Plaine, then intersects US 30. It goes north to Dysart, where it turns west, overlapping with Iowa 8. It then turns north and ends at US 20 at the southern city limit of Waterloo.


The current version of Iowa 21 is the second occurrence of the route number in the state. The first one went north from Ida Grove to the Minnesota border and was eventually replaced by US 59.

The current Iowa 21 was created in October 1934 and went between Victor and Dysart. It was extended south in 1939 to from Victor to Iowa 92, north from Dysart to U.S. 20 in Waterloo in 1969, and south again from Iowa 92 to Iowa 149 in 1980.

Major intersections

KeokukVan BurenPlank
township line
0.0000.000 Iowa 149 – Hedrick
Delta12.31419.817 Iowa 92 – Sigourney, Oskaloosa
Iowa 22 east – Thornburg
PoweshiekDeep River Township28.95846.603

Iowa 85 west / CR F52 east – Deep River, Millersburg
Warren Township37.11559.731 I-80 – Des Moines, Davenport
US 6 west – Grinnell
Southern end of US 6 overlap
IowaHartford Township44.85272.182
US 6 east – Marengo
Northern end of US 6 overlap
Honey Creek Township52.03083.734
Iowa 212 east – Marengo
county line
township line
60.80197.850 US 30 – Tama, Cedar Rapids

Iowa 8 east / CR V37 north – Vinton
Southern end of Iowa 8 overlap
TamaClark Township76.262122.732
Iowa 8 west – Traer
Northern end of Iowa 8 overlap
Black HawkWaterloo97.152156.351
US 20 / Iowa 27 – Waterloo, Dubuque, Fort Dodge
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b 2009 Volume of Traffic on the Primary Road System of Iowa (PDF) (Report). Iowa Department of Transportation. January 1, 2009. Retrieved January 14, 2011.