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
Counties: Harrison
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; it was moved westward to I-29 (exit #95) upon its completion in 1967
    Original eastern terminus: Little Sioux
    Counties: Harrison
    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: July 1, 1980 (the city of Thor took over its piece on September 15)
    Original northern terminus: IA 10 (later IA 3)
    Original southern terminus: Thor
    Counties: Humboldt
    Paving history: Unpaved at designation, it was paved in 1938.
    Replaced by: County Road P66
    Iowa 303 (I)
    Designated: June 4, 1935
    Decommissioned: April 6, 1981
    Original northern terminus: US 34 west of Fairfield
    Original southern terminus: Libertyville
    Counties: Jefferson
    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. (There is no legal description available.)
    Iowa 304
    Designated: June 4, 1935
    Decommissioned: July 1, 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
    Counties: Keokuk
    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
    Counties: Louisa
    Paving history: Unpaved at designation, it was paved in 1955.
    Replaced by: County Roads X43 (north-south segment) and G40 (east-west segment), although street signs in Louisa County refer to it as County Road 305.
    Terminus photos
    Iowa 306
    Designated: June 4, 1935
    Decommissioned: July 1, 2003
    Original western terminus: US 65
    Original eastern terminus: Derby
    Counties: Lucas
    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 (approved April 22, 1975)
    Original western terminus: US 169 in southern Madison County
    Original eastern terminus: East Peru
    Counties: Madison
    Paving history: Unpaved at designation, it was paved in 1963.
    Replaced by: County Road G68
    Note: The decommissioning of IA 307 coincided with the opening of the relocated US 169 south of Winterset.
    Iowa 308
    Designated: June 4, 1935
    Decommissioned: 1966
    Original western terminus: US 63 near New Sharon
    Original eastern terminus: Barnes City
    Counties: Mahaska
    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: July 14, 1980 (see below)
    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.
    Counties: Mahaska
    Paving history: Unpaved at designation, it was paved in 1939.
    Replaced by: County Road T39
    Note: The decommissioning date listed was when Mahaska County took over its piece of the road. Oskaloosa took over its piece on September 22, 1980, and Beacon did the same on October 28, 1980.
    Iowa 310
    Designated: June 4, 1935
    Decommissioned: December 31, 1966
    Original northern terminus: Harvey
    Original southern terminus: IA 92
    Counties: Marion
    Paving history: Unpaved at designation, it was paved in 1960.
    Replaced by: Unnumbered county road (it followed Main Street in Harvey and 216th Place)
    Iowa 311
    Designated: June 4, 1935
    Decommissioned: December 26, 1989
    Original western terminus: Liscomb; it was truncated at the east city limits on November 18, 1980.
    Original eastern terminus: IA 14
    Counties: Marshall
    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: July 1, 1980
    Original northern terminus: McIntire
    Original southern terminus: IA 9
    Counties: Mitchell
    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 segment dead-ended from US 65, and the other dead-ended from NE 118th Avenue in both directions; the segment in between was removed after the relocated US 65 opened. Both segments were transferred to local jurisdictions on January 24, 2003.
    Iowa 313
    Designated: June 4, 1935
    Decommissioned: July 10, 2002
    Original western terminus: US 59
    Original eastern terminus: Melvin; it was truncated at the west city limits on August 11, 1980.
    Counties: Osceola
    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: April 16, 2003
    Original northern terminus: US 18 east of Ruthven
    Original southern terminus: Ayrshire
    Counties: Palo Alto
    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.
    Terminus photos
    Iowa 315
    Designated: June 4, 1935
    Decommissioned: April 21, 2003
    Original western terminus: IA 4 in southern Pocahontas County
    Original eastern terminus: Palmer
    Counties: Pocahontas
    Paving history: Unpaved at designation, it was paved in 1956.
    Replaced by: County Road C56, plus local roads (Hansen Avenue and Main Street) in Palmer.
    Terminus photos
    Iowa 316
    Length: 5.8 miles/9.3 kilometers
    Northern terminus: East city limits 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:
  • March 9, 1981: Extended southward along former County Road S35 to IA 5. (This was when the state took over the segment along McKinney Street while transferring one block of Brown Street to the city. Polk County took over its share of the road on January 1, while Warren and Marion counties took over the road on January 12.)
  • August 11, 2003: Segment in Runnells was turned over to the city while Polk County took over the segment along SE 116th Street south of IA 163.
  • Iowa 317
    Designated: June 4, 1935
    Decommissioned: August 25, 1980
    Original western terminus: McCallsburg; it was truncated at US 65 on February 9, 1954
    Original eastern terminus: US 65; 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.)
    Counties: Story
    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 became unsigned IA 947 until the city assumed jurisdiction on July 25, 1986.
    Iowa 318
    Designated: June 4, 1935
    Decommissioned: July 22, 1980 (the city of Clutier took over its piece on August 18)
    Original western terminus: Clutier
    Original eastern terminus: IA 21 on the Tama/Benton county line
    Counties: Tama
    Paving history: Unpaved at designation, it was paved in 1962.
    Replaced by: County Road E36
    Iowa 319
    Designated: June 4, 1935
    Decommissioned: July 1, 1980
    Original western terminus: Gravity
    Original eastern terminus: Conway; it was truncated at IA 148 on December 13, 1961.
    Counties: Taylor
    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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