Iowa Highway 4
|Maintained by Iowa DOT|
|Length:||146.343 mi (235.516 km)|
|Existed:||January 1, 1969– present|
|History:||1920–1968: Iowa 17|
|South end:||Iowa 44 / CR P28 at Panora|
|North end:||MN 4 north of Estherville|
Iowa Highway 4 (Iowa 4) is a state highway which runs from north to south across the state of Iowa. It is 146 miles (235 km) long, beginning at an intersection with Iowa Highway 44 in Panora and ending at the Minnesota state line north of Estherville. It continues north as Minnesota State Highway 4. The route was created on January 1, 1969, when a number of route designations were changed to match other states' route numbers. Before 1969, Iowa 4 was known as Iowa 17.
Iowa Highway 4 begins at Panora at Iowa 44. It goes north and is briefly overlapped with Iowa Highway 141 north of Yale. It continues north until Jefferson, where it intersects U.S. Route 30 (US 30). It goes north, then turns west to enter Churdan, then turns north until meetin Iowa 175. At Iowa 175, the highway turns west, with Iowa 175, passing through Lohrville. It turns north west of Lohrville, and continues north through Rockwell City, where it intersects US 20.
After a short concurrency with US 20, Iowa 4 continues north, and intersects Iowa 7. They overlap through Pomeroy, then Iowa 4 goes north through Pocahontas, which is where it intersects Iowa 3. North of Pocahontas, Iowa 4 meets Iowa 10 east of Havelock before passing through Mallard. Iowa 4 then goes north into Emmetsburg, where it meets US 18.
Iowa 4 and US 18 continue west of Emmetsburg together, then Iowa 4 turns north to go through Graettinger. Iowa 4 then turns slightly northwesterly to go through Wallingford, before meeting Iowa 9 in Estherville. Iowa 4 then goes northeasterly out of Estherville before ending at the Minnesota border.
Iowa 4 was created on January 1, 1969, during an effort by the Iowa State Highway Commission (IHC) to renumber Iowa's state highways. The goal of the effort was to reduce confusion among drivers crossing into Iowa from other states by aligning Iowa's route numbers with their adjoining routes in other states. However, most of the route on which Iowa 4 is now applied has been in the primary highway system since the system was created in 1920.
At its designation, Primary Road No. 17 was a much longer route than Iowa 4 is today. Primary Road No. 17 began in Albia at Primary Road Nos. 8 (now US 34) and 59 (now Iowa 5) and headed northwest through Knoxville and Des Moines. It continued west and north by passing through Adel and Perry before turning more northerly at Jefferson. It entered Rockwell City, Pocahontas, Emmetsburg, and Estherville. It ended at the intersection of Primary Road Nos. 4 (now US 71) and 9 in Spirit Lake.
In 1926, when the U.S. Highway System was introduced, Iowa 17 was shortened on both ends. A service bulletin from the IHC in late 1925 listed Iowa 17 would begin in Jefferson and follow the same route to Estherville. However, maps published the highway commission in 1927 show the route extended south to Adel ending at US 6. By 1931, it had been extended north to the Minnesota state line along what was then Emmet County Road H (CR H).
Ten years later, the southern end of the route shifted west to its current in end Panora, replacing Iowa 150 in its entirety. The sections that were duplicate routes with US 30, US 169, and Iowa 141 were removed, while the standalone section between Grand Junction and Perry became part of Iowa 144. Over the next 28 years, sections of Iowa 17 were straightened and the paving of the route was completed.
As of 2011[update], construction of a new four-lane expressway for US 20 has caused a portion of that route to be rerouted onto Iowa 4. The expressway begins eastbound at Iowa 4 and extends across the rest of the state to Dubuque.
|Guthrie||Panora||0.000||0.000||Iowa 44 (Main Street) / CR P28 (Southeast 3rd Street)|
|Richland Township||10.251||16.497||Iowa 141 east||South end of Iowa 141 overlap|
|10.697||17.215||Iowa 141 west||North end of Iowa 141 overlap|
|Calhoun||Reading Township||44.908||72.272||Iowa 175 east / CR P13 north||South end of Iowa 175 overlap|
|Calhoun Township||53.789||86.565||Iowa 175 west||North end of Iowa 175 overlap|
|Twin Lakes Township||67.449||108.549||US 20|
|72.180||116.162||Iowa 7 east / CR D15 west||South end of Iowa 7 overlap|
|77.106||124.090||Iowa 7 west / CR C66 east||North end of Iowa 7 overlap|
|Pocahontas||87.078||140.138||Iowa 3 (Elm Street South)|
|Havelock||93.617||150.662||Iowa 10 west (Cummins Road)|
|Palo Alto||Emmetsburg||113.358||182.432||US 18 east (Main Street)||South end of US 18 overlap|
|Emmetsburg Township||118.026||189.944||US 18 west||North end of US 18 overlap|
|Emmet||Estherville||138.132||222.302||Iowa 9 (Central Avenue)|
|Ellsworth Township||146.343||235.516||MN 4|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- "2011 Volume of Traffic on the Primary Road System of Iowa" (PDF). Iowa Department of Transportation. January 1, 2011. Retrieved October 1, 2010.
- "New Iowa Map Goes on Sale". Telegraph-Herald (Dubuque, Iowa). January 14, 1969. Retrieved October 12, 2011.
- Iowa State Highway Commission (1919) (PDF). Iowa State Highway Map (Map). http://www.iowadotmaps.com/msp/historical/pdf/1919-front.pdf. Retrieved October 12, 2011.
- Service Bulletin (Iowa State Highway Commission) XIII (10–11–12): 8. October–November–December 1925.
- Iowa State Highway Commission (1927) (PDF). Iowa State Highway Map (Map). http://www.iowadotmaps.com/msp/historical/pdf/1927-front.pdf. Retrieved October 12, 2011.
- Iowa State Highway Commission (1930) (PDF). Iowa State Highway Map (Map). http://www.iowadotmaps.com/msp/historical/pdf/1930-front.pdf. Retrieved October 12, 2011.
- Iowa State Highway Commission (1931) (PDF). Iowa State Highway Map (Map). http://www.iowadotmaps.com/msp/historical/pdf/1931-front.pdf. Retrieved October 12, 2011.
- Iowa State Highway Commission (1941) (PDF). Iowa State Highway Map (Map). http://www.iowadotmaps.com/msp/historical/pdf/1941-front.pdf. Retrieved October 12, 2011.
- Iowa State Highway Commission (1968) (PDF). Iowa State Highway Map (Map). http://www.iowadotmaps.com/msp/historical/pdf/1968_front.pdf. Retrieved October 12, 2011.
- Iowa Department of Transportation (2011). Transportation Map (Map). http://www.iowadotmaps.com/msp/pdf/current/stmapmain.pdf. Retrieved October 12, 2011.
- The Iowa Highways Page by Jason Hancock