Iowa Highways: 320 to 339

Jump directly to route:
300-319 320 321 322 323 324 325 326 327 328 329 340-359
330 331 332 333 334 335 336 337 338 339
For an explanation of the route listings, click here.

Iowa 320
Designated: June 4, 1935
Decommissioned: 1963
Original western terminus: US 169; it was extended westward to replace an old east-west segment of US 169 after the relocated US 169 north of Fort Dodge opened on November 18, 1960.
Original eastern terminus: Badger
Counties: Webster
Paving history: Unpaved at designation, the road had a bituminous surface at the time of decommissioning (but has since been paved).
Replaced by: County road (now numbered C56)
Iowa 321
Designated: June 4, 1935
Decommissioned: 1963
Original northern terminus: Clare
Original southern terminus: IA 5 (now IA 7)
Counties: Webster
Paving history: Unpaved at designation, the road remained gravel at decommissioning. Only the east-west segment into Clare has been paved.
Replaced by: County road (now numbered C66) and an unnumbered north-south gravel road (Eastern Avenue in Webster County)
Iowa 322 (I)
Designated: June 4, 1935
Decommissioned: January 1, 1969
Original northern terminus: Rake; in 1949 the north end was moved to the Minnesota state line north of Rake, as the road was straightened that year.
Original southern terminus: IA 9 east of Buffalo Center
Counties: Winnebago
Paving history: Unpaved at designation, it was paved in 1955.
Replaced by: IA 254 (II) in a numbering swap
Iowa 322 (II)
Designated: January 1, 1969
Decommissioned: July 19, 1972
Original northern terminus: IA 92
Original southern terminus: Massena
Counties: Cass
Paving history: The entire road was paved at the time of designation.
Replaced by: City street (Main Street in Massena); this replaced IA 254 (I).
Iowa 322 (III)
Designated: July 19, 1982
Decommissioned: July 1, 2003
Original northern terminus: IA 92 west of Winterset
Original southern terminus: Pammel State Park
Counties: Madison
Paving history: The entire road was paved at the time of designation.
Replaced by: County Road P68. This replaced IA 162 at the request of the Pammel State Park officer, who expressed concerns that truck drivers were confusing the road for nearby US 169.
Terminus photos
Iowa 323
Designated: June 4, 1935
Decommissioned: July 15, 1980 (the city of Woolstock took over its piece on July 22)
Original western terminus: IA 60 (later IA 17)
Original eastern terminus: Woolstock
Counties: Wright
Paving history: Unpaved at designation, it was paved in 1955.
Replaced by: County Road C70, plus Alice Street in Woolstock.
Iowa 324 (I)
Designated: June 4, 1935
Decommissioned: 1954
Original northern terminus: US 20 east of Sioux City
Original southern terminus: Lawton
Counties: Woodbury
Paving history: There were no paved segments.
Replaced by: County road (now numbered K49), after US 20 was re-routed closer to Lawton.
Iowa 324 (II)
Designated: February 25, 1956
Decommissioned: July 1, 2003
Original northern terminus: Lewis and Clark State Park
Original southern terminus: IA 175 west of Onawa
Counties: Monona
Paving history: Unpaved at designation, it was paved in 1967.
Replaced by: Unnumbered county road (name is Park Loop)
Terminus photos
Iowa 325
Designated: June 4, 1935
Decommissioned: July 1, 2003
Original western terminus: Spillville; it was truncated at the east city limits on July 1, 1980.
Original eastern terminus: US 52 north of Calmar
Counties: Winneshiek
Paving history: Unpaved at designation, it was paved in 1955.
Replaced by: County Road B16. It was originally designated as a spur from Protivin to US 52, utilizing what is now B16 west of Spillville. Protivin wanted a direct connection to Cresco instead, so the Highway Commission agreed to truncate 325 at Spillville and extend IA 139 southward the day after its designation. On July 9, 1935, the Highway Commission denied Spillville's request to add the Protivin segment back to IA 325.
Terminus photos
Iowa 326
Designated: June 4, 1935
Decommissioned: November 11, 1981
Original northern terminus: Bristow
Original southern terminus: IA 3 east of Dumont
Counties: Butler
Paving history: Unpaved at designation, it was paved in 1955.
Replaced by: County Road T24
Former terminus photos
Iowa 327
Designated: June 4, 1935
Decommissioned: July 1, 2003
Original northern terminus: Orleans; it was extended to a county road (later numbered A15) north of Orleans on December 10, 1935
Original southern terminus: IA 276 north of Spirit Lake
Counties: Dickinson
Paving history: The segment from IA 276 to Orleans was paved at the time of designation, while the segment north of Orleans appeared as a bituminous surface on maps as late as 1991; all maps after 1994 showed it as paved.
Replaced by: Local road (250th Avenue). It was created from part of a former US 71 segment north of Spirit Lake which was part of IA 276 for a short time.
Terminus photos
Iowa 328
Designated: July 10, 1935
Decommissioned: December 19, 1980
Original northern terminus: Galva
Original southern terminus: US 20
Counties: Ida
Paving history: Unpaved at designation, it was paved in 1937.
Replaced by: County Road M25. The segment inside Galva remained under state jurisdiction as unsigned IA 943 until January 20, 1987.
Former terminus photos
Iowa 329
Designated: July 23, 1935
Decommissioned: July 1, 1980
Original western terminus: US 169 at Boxholm
Original eastern terminus: Pilot Mound
Counties: Boone
Paving history: Unpaved at designation, it was paved in 1959.
Replaced by: County Road E18
Note: This highway was originally numbered IA 328 on June 18, 1935, but the spur to Galva was assigned the same number on July 10. Realizing that there were two highways with the same number, the Highway Commission decided to renumber this spur as IA 329 on July 23.
Iowa 330 (I)
Designated: July 23, 1935
Decommissioned: 1947
Original northern terminus: US 18 in western Chickasaw County
Original southern terminus: Ionia
Paving history: There were no paved segments.
Replaced by: IA 393
Iowa 330
Length: 48 miles/77 kilometers
Northeastern terminus: IA 14 north of Marshalltown
Southwestern terminus: I-80 (exit #142) in Altoona
Terminus photos

Counties: Marshall, Story, Jasper, Polk
Cities along route: Altoona, Bondurant, Albion

NHS: Entire route
Expressway segments:
  • 35 miles, from the southwestern terminus to US 30

  • Multiplexes: 15 miles with US 65, from I-80 to the junction with IA 117 northwest of Mingo
    History
    Designated: 1947, to a former segment of US 30 through Marshalltown after US 30 was re-routed to its south
    Paving history: The entire road was paved at the time of designation.
    Major alignment changes:
  • January 1, 1969: Extended southwestward along the former IA 64 segment between US 30 and US 65.
  • December 26, 1989: Re-routed around Marshalltown via the former IA 233 and County Road S75. The old route outside of Marshalltown became County Road E41.
  • December 2012 (approved July 17): Extended southwestward from IA 117 to I-80 along an existing expressway segment as a second number with US 65.
  • Upgrades:
  • October 10, 2002: 5-mile expressway segment, between a point northeast of Melbourne and US 30, opens
  • November 22, 2002: 15-mile expressway segment between the southwestern terminus and Melbourne opens
  • Notes
  • This diagonal road in central Iowa was built from Des Moines to Marshalltown in the mid-1930s and was originally signed as IA 88 (I) before becoming part of the cross-state IA 64 in 1939. As a result of the Great Renumbering of 1969, the diagonal had two separate numbers — US 65 and IA 330 — until December of 2012, when IA 330 was extended southwestward to I-80 to give the diagonal expressway a continuous number (similar to what was done with IA 27 and the extended IA 163). The request was made by the city of Marshalltown and Iowa DOT District 1, per the legal descriptions.
  • According to Jeff Morrison, the north end of IA 330 was temporarily in a different place as a result of a construction project circa 1995: "When IA 14 was detoured between Marshalltown and [County Road] E18 using [US] 30, [IA] 330, [County Road] S75, and E18, the "End 330" was posted at the S75 junction north of Albion. (They did not want anyone going to 14 while it was being rebuilt, and since the destination of 330 is 14 anyway, it met its goal north of Albion.)"
  • Iowa 331 (I)
    Designated: August 6, 1935
    Decommissioned: August 30, 1967
    Original western terminus: Eldridge
    Original eastern terminus: US 61 north of Davenport
    Counties: Scott
    Paving history: Unpaved at designation, it was paved in 1966 (just before decommissioning).
    Replaced by: County road (now numbered F45)
    Iowa 331 (II)
    Designated: October 10, 2002
    Decommissioned: 2005
    Original western terminus: A point between I-35 and South 42nd Street in West Des Moines
    Original eastern terminus: IA 28 in Des Moines
    Counties: Polk
    Replaced by: Local road (Army Post Road)
    This was the designation for a former segment of IA 5 in West Des Moines bypassed when the last segment of the freeway opened. (The west end was a dead-end due to reconstruction of the I-35/IA 5 interchange.) The DOT approved transfer of the road to the city on October 14, 2003, but the transfer was not completed until sometime in 2005 and is not mentioned in the legal description.
    Iowa 332
    Designated: August 20, 1935
    Decommissioned: July 1, 1980
    Original northern terminus: IA 9 east of Forest City
    Original southern terminus: Pilot Knob State Park
    Counties: Winnebago
    Paving history: Unpaved at designation, the road remained gravel at the time of decommissioning (but has since been paved).
    Replaced by: Unnumbered county road (205th Avenue). The Highway Commission originally numbered this road IA 235 on July 10, but that number was given to a spur to Rhodes instead.
    Iowa 333
    Length: 1.6 miles/2.5 kilometers
    Western terminus: I-29 (exit #1) west of Hamburg
    Eastern terminus: US 275 in Hamburg
    Terminus photos

    Counties: Fremont
    History
    Designated: September 4, 1935, as a spur from US 59 eastward to Northboro
    Paving history: There were no paved segments at designation. The segment west of US 59 was paved in 1964 and decommissioned after that. The segment between US 59 and the Fremont/Page county line was paved in 1976, six years after it was given to Fremont County, while the segment in Page County remained gravel until it was paved (and subsequently decommissioned) in 1980. The post-1980 segment was entirely paved.
    Major alignment changes:
  • June 30, 1937: Extended eastward to IA 208 north of Blanchard; the spur to Northboro became IA 343.
  • June 7, 1939: Extended westward from US 59 to US 275 in Hamburg
  • June 1, 1943: Extended eastward from IA 208 through College Springs to US 71 south of Shambaugh, following the former IA 84 (I) along the way.
  • 1948: Straightened to run due eastward from US 59 to US 71 north of Braddyville; the segment through College Springs was turned over to Page County.
  • 1951: Realigned, again, to follow the former IA 84 (I) through College Springs.
  • November 1, 1964: Truncated west of US 59 (and signed as County Road J64 after the present-day county road numbering system was adopted), leaving only the segment between US 59 and US 71.
  • 1968: Straightened to run due eastward from US 59 to US 71. The old segments north of College Springs became County Road J52 and Nutmeg Avenue, while the segment between College Springs and relocated IA 333 was the unsigned IA 999 until December 15, 1980 (it is now Maple Avenue in Page County and South Street, Omaha Avenue, Kansas Street, and Missouri Avenue in College Springs).
  • December 15, 1980: Original segment from US 59 to US 71 decommissioned, removing the road from Page County; the segment, which reopened as a paved road on December 6, became County Road J64.
  • December 19, 1980: Routed westward from US 59 to I-29 at Hamburg along the former County Road J64. This segment ran parallel to the Missouri state line, with only one mile separating the two. It became a state highway as the result of a proposed exchange of roads announced in February — Fremont County would take IA 184 in exchange for an extension of IA 145 and a new connecting road between I-29 and US 275. On June 19, a state appeals board ruled that the DOT had to keep IA 184 while the county could take IA 42, but the board upheld a lower appeals board's ruling that the state also had to take J64 — which it did not want — between I-29 and US 275. While the DOT unsuccessfully appealed that ruling, the Fremont County Board of Supervisors passed a resolution on October 29 stating that J64 became the state's responsibility on October 10. (The legal holdup may explain IA 333's absence from the 1981 state transportation map.)
  • July 1, 2003: Truncated east of US 275 in Hamburg. The old segment between US 275 and US 59 became County Road J64 (its pre-1980 designation).
  • Iowa 334 (I)
    Designated: October 16, 1935
    Decommissioned: July 1, 1980
    Original western terminus: US 63
    Original eastern terminus: Frederika
    Counties: Bremer
    Paving history: Unpaved at designation, it was paved on a new alignment in 1955.
    Replaced by: County Road C16
    Iowa 334 (II)
    This designation was given to the former segment of US 34 from Ottumwa through Agency to the junction with IA 16 north of Eldon in Wapello County that was bypassed when a new four-lane segment opened in October 2006. It was transferred to local jurisdictions on September 5, 2007.
    Iowa 335 (I)
    Designated: October 29, 1935
    Decommissioned: July 1, 1980
    Original northern terminus: Dawson
    Original southern terminus: IA 141
    Counties: Dallas
    Paving history: Unpaved at designation, it was paved in 1957.
    Replaced by: County Road P46
    Iowa 335 (II)
    This unsigned highway was assigned to the former segment of IA 163 through Otley that was bypassed in 1999; it was turned over to Marion County on February 16, 2001.
    Iowa 336
    Designated: January 21, 1936
    Decommissioned: June 30, 1980 (the city of Rowley took over its piece on August 1)
    Original western terminus: IA 150
    Original eastern terminus: Rowley
    Counties: Buchanan
    Paving history: Unpaved at designation, it had a bituminous surface at decommissioning (but has since been paved).
    Replaced by: County Road D41
    Iowa 337 (I)
    Designated: April 14, 1936
    Decommissioned: July 1, 1980
    Original northern terminus: Grafton
    Original southern terminus: IA 9
    Counties: Worth
    Paving history: Unpaved at designation, it was paved in 1957.
    Replaced by: County Road S62
    Iowa 337 (II)
    This unsigned former segment of US 218 in Floyd County, between the north end of the Charles City bypass and IA 14 in Charles City, was designated after the bypass opened in August 2000. It was turned over to local jurisdictions on November 20, 2001, but remains signed as part of Business US 218.
    Iowa 337 (III)
    This was the designation for a former segment of US 151 southwest of Monticello (through the unincorporated town of Langworthy) that was bypassed by an expressway segment in 2003. It was turned over to Jones County on October 11, 2004.
    Iowa 338
    Designated: May 26, 1936
    Decommissioned: April 12, 1972
    Original northern terminus: Bondurant
    Original southern terminus: US 65
    Counties: Polk
    Paving history: Unpaved at designation, it was paved in 1957.
    Replaced by: City streets (Grant, 1st, and Main Streets in Bondurant). The segment along Grant Street was part of IA 945 from 1980 to 2003.
    Iowa 339
    Designated: August 4, 1936
    Decommissioned: September 30, 2000
    Original northern terminus: IA 9
    Original southern terminus: George; a short east-west segment along Michigan Avenue was turned over to the city on August 31, 1990.
    Counties: Lyon
    Paving history: Unpaved at designation, it was paved in 1938.
    Replaced by: County Road L14 (at decommissioning)
    Former terminus photos

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