Iowa Highways: 300 to 319

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280-299 300 301 302 303 304 305 306 307 308 309 320-339
310 311 312 313 314 315 316 317 318 319
For an explanation of the route listings, click here.

Iowa 300
Designated: June 4, 1935 Decommissioned: July 1, 2003
Original northern terminus: Modale
Original southern terminus: US 30 near California Junction
Paving history: Unpaved at designation, the original segment remained gravel when IA 300 was rerouted. The post-1967 alignment was entirely paved.
Major alignment change: In 1967, IA 300 became an east-west spur between Modale and I-29 (exit #82) upon this segment of I-29's completion.
Replaced by:
  • Unnumbered county roads (old north-south alignment in 1967)
  • County Road F50 (at decommissioning)

  • Terminus photos (1967-2003 alignment)
    Iowa 301
    Designated: June 4, 1935 Decommissioned: July 1, 2003
    Original western terminus: US 75 in northwestern Harrison County; it was moved westward to I-29 (exit #95) upon its completion in 1967
    Original eastern terminus: Little Sioux
    Paving history: Unpaved at designation, it was upgraded from bituminous to paved in 1975.
    Replaced by: County Road F20 and local streets (2nd Street and Mulberry Street) in Little Sioux
    Terminus photos
    Iowa 302
    Designated: June 4, 1935 Decommissioned: 1980
    Original northern terminus: IA 10 (later IA 3) in eastern Humboldt County
    Original southern terminus: Thor
    Paving history: Unpaved at designation, it was paved in 1938.
    Replaced by: County Road P66
    Iowa 303 (I)
    Designated: June 4, 1935 Decommissioned: 1981
    Original northern terminus: US 34 west of Fairfield
    Original southern terminus: Libertyville
    Paving history: Unpaved at designation, it was upgraded from bituminous to paved in 1973.
    Replaced by: County Road V64
    Former terminus photos
    Iowa 303 (II)
    Listed on the Wisconsin DOT's 2008 Numbering State Trunk Highways survey, this was the designation for the former segment of US 151 through Monticello that was bypassed by an expressway segment in 2004. It was turned over to Jones County by the end of the year. It is still signed as Business US 151.
    Iowa 304
    Designated: June 4, 1935 Decommissioned: August 26, 1980
    Original western terminus: IA 149 east of Martinsburg; it was truncated to a point two miles south of Ollie in 1948
    Original eastern terminus: Ollie
    Paving history: Unpaved at designation, it was paved in 1960.
    Replaced by: IA 78 (in 1948); County Road V5G (at decommissioning)
    Iowa 305
    Designated: June 4, 1935 Decommissioned: July 1, 2003
    Original western terminus: Letts
    Original eastern terminus: US 61, later US 61/IA 92, in northern Louisa County
    Paving history: Unpaved at designation, it was paved in 1955.
    Replaced by: County Roads X43 (north-south segment) and G40 (east-west segment), according to the 2004 state transportation map, or County Road 305, according to correspondence between Jeff Morrison and Louisa County officials in December 2003. Either way, there was no signage up as of October 2006.
    Terminus photos
    Iowa 306
    Designated: June 4, 1935 Decommissioned: July 1, 2003
    Original western terminus: US 65 in southwestern Lucas County
    Original eastern terminus: Derby
    Paving history: Unpaved at designation, it was paved in 1955.
    Replaced by: County Road H50
    Terminus photos
    Iowa 307
    Designated: June 4, 1935 Decommissioned: 1976
    Original western terminus: US 169 in southern Madison County
    Original eastern terminus: East Peru
    Paving history: Unpaved at designation, it was paved in 1963.
    Replaced by: County Road G68
    Iowa 308
    Designated: June 4, 1935 Decommissioned: 1966
    Original western terminus: US 63 near New Sharon
    Original eastern terminus: Barnes City
    Paving history: Unpaved at designation, it remained gravel at decommissioning (but has since been paved).
    Replaced by: County roads (now numbered G17 and V13)
    Iowa 309
    Designated: June 4, 1935 Decommissioned: 1980
    Original western terminus: Beacon
    Original eastern terminus: IA 92 in Oskaloosa; it was truncated at IA 137 (now part of US 63) before its decommissioning.
    Paving history: Unpaved at designation, it was paved in 1939.
    Replaced by: County Road T39
    Iowa 310
    Designated: June 4, 1935 Decommissioned: 1967
    Original northern terminus: Harvey
    Original southern terminus: IA 92 in eastern Marion County
    Paving history: Unpaved at designation, it was paved in 1960.
    Replaced by: Unnumbered county road
    Iowa 311
    Designated: June 4, 1935 Decommissioned: 1989
    Original western terminus: Liscomb; it was truncated at the east city limits in 1980.
    Original eastern terminus: IA 14 in northern Marshall County
    Paving history: Unpaved at designation, it was paved in 1961.
    Replaced by: County Road E18
    Former terminus photos
    Iowa 312 (I)
    Designated: June 4, 1935 Decommissioned: 1980
    Original northern terminus: McIntire
    Original southern terminus: IA 9 in eastern Mitchell County
    Paving history: Unpaved at designation, it was paved in 1955.
    Replaced by: County Road T62
    Iowa 312 (II)
    This number was assigned to two former US 65 segments near Engledinger Marsh in northeastern Polk County that were bypassed after a new four-lane segment opened in November 2002. One dead-ends from US 65, and the other dead-ends from NE 118th Avenue in both directions. Both segments were transferred to local jurisdictions in 2003.
    Iowa 313
    Designated: June 4, 1935 Decommissioned: 2002
    Original western terminus: US 59 in southern Osceola County
    Original eastern terminus: Melvin; it was truncated at the west city limits in 1980
    Paving history: Unpaved at designation, it was paved in 1937.
    Replaced by: County Road A48
    Former terminus photos
    Iowa 314
    Designated: June 4, 1935 Decommissioned: 2003
    Original northern terminus: US 18 east of Ruthven
    Original southern terminus: Ayrshire
    Paving history: Unpaved at designation, it was paved in 1940.
    Replaced by: County Road N28 outside of Ayrshire; it made a turn eastward before ending and continued as County Road B53. Palo Alto County agreed to take over its share of IA 314 on December 3, 2002, and the city of Ayrshire agreed to follow suit on December 13. The DOT approved both transfers on January 14, 2003, and after contacting the county, Jeff Morrison reported that the signs came down on April 16.
    Terminus photos
    Iowa 315
    Designated: June 4, 1935 Decommissioned: 2003
    Original western terminus: IA 4 in southern Pocahontas County
    Original eastern terminus: Palmer
    Paving history: Unpaved at designation, it was paved in 1956.
    Replaced by: County Road C56 outside of Palmer, and local roads in Palmer. Pocahontas County voted to take over IA 315 on December 17, 2002; the city of Palmer eventually followed suit. The DOT approved both transfers on February 18, 2003, and after contacting the county, Jeff Morrison reported that the signs were taken down sometime between March 20 and April 25.
    Terminus photos
    Iowa 316
    Length: 5.2 miles/8.4 kilometers
    Northern terminus: Vandalia Road southeast of Runnells
    Southern terminus: IA 5 on the Warren/Marion county line
    Terminus photos

    Counties: Polk, Warren, Marion
    History
    Designated: June 4, 1935, as a spur from the then-US 163 southward into Runnells
    Paving history: Unpaved at designation, the original segment was paved in 1957. The 1980 extension was entirely paved.
    Major alignment changes:
  • 1980: Extended southward along former County Road S35 to IA 5
  • 2003: Segment north of Runnells was turned over to Polk County, a year after the city of Runnells accepted jurisdiction (even though signage hadn't changed). Signs were removed between June 28 and September 28. The old segment will probably carry the County Road S27 designation that runs northward from IA 163, but it (like other Polk County roads) isn't signed as such.
  • Iowa 317
    Designated: June 4, 1935 Decommissioned: 1980
    Original western terminus: McCallsburg; it was truncated at US 65 on February 9, 1954
    Original eastern terminus: US 65 in northeast Story County; it was extended eastward to Zearing in 1950, replacing IA 387 (I) and sharing part of US 65 along the way. (The duplication with US 65 was removed when the segment from US 65 to McCallsburg was decommissioned.)
    Paving history: Unpaved at designation, the remaining segment from US 65 to Zearing was paved in 1955.
    Replaced by: County road, now numbered E18 (in 1954); local road (Main Street in Zearing, at decommissioning). The segment in Zearing remained under state control until 1981.
    Iowa 318
    Designated: June 4, 1935 Decommissioned: May 27, 1980
    Original western terminus: Clutier
    Original eastern terminus: IA 21 on the Tama/Benton county line
    Paving history: Unpaved at designation, it was paved in 1962.
    Replaced by: County Road E36
    Iowa 319
    Designated: June 4, 1935 Decommissioned: 1980
    Original western terminus: Gravity
    Original eastern terminus: Conway; it was truncated at IA 148 in central Taylor County in 1961.
    Paving history: Unpaved at designation, the segment from the western split with IA 49 to Conway was paved in 1955. The remaining segment between Gravity and IA 148 was paved in 1962 (at the same time as IA 148).
    Replaced by:
  • County road, now numbered J35
  • (standalone segments east of IA 148 in 1961)
  • IA 49 (segment between IA 344 and Conway in 1961)
  • County Road J35 (at decommissioning)

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    © 1997-2012 by Jason Hancock / Last updated January 29, 2012