Iowa Highways: 160 to 179

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140-159	160	161	162	163	164	165	166	167	168	169	180-199
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For an explanation of the route listings, click here.

Iowa 160 (I)

Designated: March 4, 1930
Decommissioned: 1946
Original western terminus: Wild Cat Den State Park
Original eastern terminus: US 61 east of Muscatine
Counties: Muscatine
Paving history: There were no paved segments.
Replaced by: IA 389 (I)

	Iowa 160
	Length: 2.4 miles/3.9 kilometers Western terminus: IA 415 in Ankeny Eastern terminus: I-35 (exit #90) in Ankeny Terminus photos Counties: Polk The entire route is within the city limits of Ankeny. NHS: Entire route
	History
	Designated: July 1947, as a diagonal connector between IA 60 (now 415) and US 69 Paving history: The entire road was paved at the time of designation. Major alignment changes: July 1, 1980: Extended eastward from US 69 to I-35 March 14, 1986: Straightened west of US 69 to intersect IA 415 at a T-intersection

Iowa 161 (I)

Designated: July 6, 1938
Decommissioned: 1944
Original western terminus: IA 25
Original eastern terminus: Springbrook State Park
Counties: Guthrie
Paving history: There were no paved segments.
Replaced by: IA 384. Before 1938 the number was reserved for US 161.

Iowa 161 (II)

Designated: 1944
Decommissioned: February 22, 1951
Original western terminus: US 61 in Keokuk
Original eastern terminus: Illinois state line (Mississippi River); continued eastward as IL 10.
Counties: Lee
Paving history: The entire road was paved at the time of designation.
Replaced by: US 136
Note: While its first appearance on a state highway map was in 1949, this version of IA 161 appeared on Lee County maps in 1944, shortly after the previous IA 161 was renumbered as IA 384.

Iowa 161 (III)

Designated: December 27, 1951
Decommissioned: July 1, 2003
Original northwestern terminus: IA 141 west of Dedham
Original southeastern terminus: IA 141 south of Dedham
Counties: Carroll
Paving history: The entire road was paved at the time of designation.
Replaced by: County Roads E60 (east-west segment) and N33 (north-south segment). This was a former segment of IA 141.
Terminus photos

Iowa 162 (I)

Designated: March 4, 1930
Decommissioned: July 19, 1982
Original northern terminus: IA 2 (I), later IA 92, west of Winterset
Original southern terminus: Devil's Backbone (later Pammel) State Park
Counties: Madison
Paving history: Unpaved at designation, it was upgraded from bituminous to paved around 1981.
Replaced by: IA 322. Why the numbering change? According to the IA 322 legal description, "The park officer at Pammel State Park has expressed concern of evident confusion of semi trucks turning south on Iowa 162 (two to three trucks per week) while apparently looking for US 169 approximately 1 Ľ miles east of Iowa 162. It is very difficult for these vehicles to turn around. Due to the inconvenience caused by the closeness of route numbers, Iowa 162 should be re-designated as Iowa 322 to eliminate this confusion."
Former terminus photos

Iowa 162 (II)

Designated: August 1, 2000
Decommissioned: May 1, 2006
Northern terminus: US 18 in Charles City
Southern terminus: US 218/IA 27 south of Charles City
Counties: Floyd
Paving history: The entire road was paved at the time of designation.
Replaced by: A relocated US 18
This unsigned highway number was designated to a former segment of US 218 after the Charles City bypass opened in 2000. It originally was a four-mile segment that went southeastward from Charles City to US 218 toward the end of the four-lane segment, but on November 20, 2001, this designation was reassigned to a north-south road (Grand Avenue) between US 18 and the US 218/County Road T64 interchange while the old segments became an unnumbered county road known as "Old Highway Road" (see Jeff Morrison's Super Secret Roads Page for maps). While US 18 replaced this route in 2006, this segment remains signed as part of Business US 218.
Former terminus photos

Iowa 163 (I)

Designated: March 4, 1930
Decommissioned: December 4, 1934
Original western terminus: Ambrose A. Call State Park
Original eastern terminus: US 169 south of Algona
Counties: Kossuth
Paving history: There were no paved segments.
Replaced by: IA 274. Between 1934 and 1938 the number was used for US 163.

	Iowa 163
	Length: 166 miles/267 kilometers Western terminus: US 69 (14th Street) in Des Moines Eastern terminus: Illinois state line (Mississippi River) at Burlington (with US 34) Terminus photos Counties: Polk, Jasper, Marion, Mahaska, Wapello, Jefferson, Henry, Des Moines Cities along route: Des Moines, Pleasant Hill, Prairie City, Monroe, Pella, Oskaloosa, Eddyville, Ottumwa, Agency, Batavia, Fairfield, Lockridge, Westwood, Mount Pleasant, New London, Middletown, West Burlington, Burlington NHS: Entire route Commercial and Industrial Network: Entire route Freeway segments: 5 miles to the west and south of Monroe 5 miles to the west and south of Pella 3 miles to the west and south of Oskaloosa, between IA 92 and the northern split with US 63 16 miles, from 145th Avenue north of Ottumwa to IA 16 north of Eldon, including bypasses of Ottumwa and Agency (with US 63 for 8 miles and US 34 for the other 8) 7 miles, bypass to the south of Fairfield (with US 34) 8 miles, bypass to the north of Mount Pleasant (with US 34 and partially with US 218 and IA 27) 8 miles, from Middletown through Burlington (with US 34) Expressway segments: 21 miles between Pleasant Hill and the west end of the Monroe bypass 10 miles between the Monroe and Pella bypasses 13 miles between the Pella and Oskaloosa bypasses 18 miles, from the western split with IA 163 south of Oskaloosa to 145th Avenue north of Ottumwa (with US 63). This includes two interchanges in Eddyville. 12 miles, from IA 16 north of Eldon to the west end of the Fairfield bypass, including a bypass of Batavia (with US 34) 15 miles, from the east end of the Fairfield bypass to the west end of the Mount Pleasant bypass (with US 34) 17 miles, from US 218 in Mount Pleasant to the end of the freeway segment at Middletown, including bypasses of New London and Danville (with US 34) Exit lists: Segment between US 65 and US 34 in Ottumwa Segment between Ottumwa and Burlington (multiplexed with US 34) Multiplexes: 27 miles with US 63, from exit #60 south of Oskaloosa to exit #191 in Ottumwa 78 miles with US 34, from Ottumwa to Burlington. This includes a 2½-mile, four-highway multiplex with US 218 and IA 27 in the Mount Pleasant area. Before its 2009 extension to Burlington, IA 163 did not multiplex with any highway.
	History
	Designated: January 1, 1938 (number approved July 21, 1937), to the former US 163 Paving history: The entire road was paved at the time of designation. Major alignment changes: January 1, 1969: Duplicate segment with IA 92 west of US 63 in Oskaloosa removed October 2009: Extended eastward from Oskaloosa to Burlington as a second number to US 63 and US 34. This was done to give the Des Moines-to-Burlington expressway one continuous number, similar to what was done with IA 27 along the Avenue of the Saints. The IA 163 extension did not appear on the 2010 state transportation map but many signs were placed along US 63 and US 34 by the end of 2009. It was added to the legal descriptions on July 27, 2010, and appears on maps starting in 2011. For alignment changes in Des Moines, Ottumwa, and Burlington that are not listed here, please see their respective highway chronology pages. Upgrades: 1964: 5-mile expressway segment between NE 70th Street (south of Altoona) and IA 316 opened 1965: 3-mile expressway segment between Pleasant Hill and NE 70th Street opened 1992: Four-lane segment between IA 316 and a point east of the Polk/Jasper county line opened October 17, 1994: Freeway segment bypassing Pella opened 1995: Expressway segment from a point east of the Polk/Jasper county line to a point west of Prairie City opened 1996: Expressway segments between County Road F62 and the northwest end of the proposed Monroe bypass, and between the southeast end of the Monroe bypass and the west end of the Pella bypass (excluding Otley) opened. September 23, 1997: Route extended from IA 92 west of Oskaloosa to US 63 south of town via a new 3-mile freeway segment. June 24, 1998: 2-mile expressway segment between County Road G43 northwest of Oskaloosa and IA 92 opened; the old segment became unsigned IA 432. September 3, 1998: Expressway bypass around Prairie City, from the previous end of the four-lane segment to County Road F62, opened; the old segment became the unsigned IA 392 (II) and an extension of IA 117. July 1999: Expressway bypasses around Monroe and Otley opened. The old segment through Monroe became the unsigned IA 374 (II), and the old segment through Otley became IA 335 (II). September 30, 1999: Expressway segment between the Pella and Oskaloosa bypasses completed
	Business IA 163
	Pella: Designated in 1994 after the opening of the bypass; it follows IA 163's original alignment through town (Washington Street, Main Street, and Oskaloosa Street). It is under local jurisdiction now, but the 5.4-mile route was designated as IA 968 for a year after 163 was relocated. (Terminus photos)

Iowa 164

Designated: March 4, 1930
Decommissioned: October 22, 1990
Original northern terminus: US 30 in Boone
Original southern terminus: Ledges State Park
Counties: Boone
Paving history: Unpaved at designation, it was gravel at the time of decommissioning (but has since been paved).
Replaced by: County Road R27
Note: After the first four-lane segment of US 30 in Boone County opened in 1964, it was shortened from six miles to four miles as the north end was moved to the relocated US 30.
Former terminus photos

Iowa 165 (I)

Designated: March 4, 1930
Decommissioned: December 19, 1955
Original western terminus: Lewis & Clark State Park
Original eastern terminus: US 75 in Onawa
Counties: Monona
Paving history: There were no paved segments.
Replaced by: IA 175

	Iowa 165
	Length: 0.5 mile/0.8 kilometer Western terminus: Nebraska state line at Carter Lake Eastern terminus: Nebraska state line at Carter Lake (again - see below) Terminus photos Counties: Pottawattamie NHS: Entire route (Abbott Drive in Omaha is also part of the NHS even though it is not a state highway) Commercial and Industrial Network: Entire route
	History
	Designated: February 7, 1956 Paving history: The entire road was paved at the time of designation. For maps of the route, see Jeff Morrison's Council Bluffs/Omaha Highway Chronology page.
	Notes
	IA 165 is the state highway through Carter Lake, which is surrounded by Omaha, Nebraska, after flooding changed the course of the Missouri River in 1877. (After litigation between Iowa and Nebraska, the U.S. Supreme Court ruled that the Carter Lake area belonged to Iowa in 1892, and Carter Lake incorporated as a city in 1930.) The Highway Commission took over Carter Lake's share of Abbott Drive after Eppley Airfield became Omaha's main airport. Carter Lake has no direct connections with the rest of Iowa, and IA 165 has no corresponding route in Nebraska — just Abbott Drive in Omaha. This is the most direct route from downtown Omaha to Eppley Airfield, even though it runs through another state along the way. Iowa welcome signs are present at both ends, but there is no corresponding state line signage for Nebraska at either end. IA 165 became the shortest signed state highway in Iowa after the decommissioning of 0.2-mile IA 405 on July 1, 2003. However, it isn't always signed, as the markers next to the welcome signs were reported missing in 2008 and again in 2023.

Iowa 166

Designated: March 19, 1930
Decommissioned: November 10, 1980 (the city of Hastings took over its share on October 6)
Original northern terminus: US 34
Original southern terminus: Hastings
Counties: Mills
Paving history: Unpaved at designation, the road was paved in 1948.
Replaced by: County Road M16
Former terminus photos

Iowa 167

Designated: April 1930 (number approved March 19)
Decommissioned: August 11, 1980
Original western terminus: Doon
Original eastern terminus: US 75
Counties: Lyon
Paving history: Unpaved at designation, it was paved in 1938.
Replaced by: Local roads (Main Street and 3rd Avenue) in Doon — IA 167 made a turn to the south before ending — and County Road A44 east of Doon.

Iowa 168

Designated: April 28, 1930
Decommissioned: September 23, 1980
Original northern terminus: Shelby
Original southern terminus: IA 7 (later IA 64 and IA 83, and now County Road G18) east of Minden
Counties: Shelby, Pottawattamie
Paving history: Unpaved at designation, it was upgraded from bituminous to paved in 1957.
Replaced by: County Road M16

Iowa 169

Designated: April 28, 1930
Decommissioned: June 25, 1930
Original northern terminus: IA 7 at Kimballton
Original southern terminus: Elk Horn
Counties: Audubon, Shelby
Paving history: There were no paved segments.
Replaced by: IA 173. This short-lived highway had to be renumbered because of US 169.

Iowa 170

Designated: May 27, 1930
Decommissioned: August 21, 1974
Original northern terminus: US 18
Original southern terminus: Everly
Counties: Clay
Paving history: Unpaved at designation, the road was paved in 1931.
Replaced by: County Road M27. It was created from part of US 18 after it was realigned between Everly and Spencer.

Iowa 171 (I)

Designated: June 11, 1930
Decommissioned: September 18, 1935
Original western terminus: Wall Lake State Park (now Big Wall Lake Wildlife Area)
Original eastern terminus: IA 15 (later US 69)
Counties: Wright
Paving history: There were no paved segments.
Replaced by: Unnumbered county road

Iowa 171 (II)

Designated: October 1, 1935
Decommissioned: July 1, 1980
Original western terminus: Elberon
Original eastern terminus: IA 21
Counties: Tama
Paving history: Unpaved at designation, the entire road was paved in 1959.
Replaced by: City street in Elberon (it followed Main Street for a block) and County Road E44

Iowa 172

Designated: June 11, 1930
Decommissioned: July 1, 1980 (the city of Clermont took over its piece on July 8)
Original northern terminus: US 18 in Clermont
Original southern terminus: Elgin
Counties: Fayette
Paving history: Unpaved at designation, the entire road was paved in 1962.
Replaced by: County Road W51, plus city streets (Main, Clermont, and Center Streets) in Elgin

	Iowa 173
	Length: 15 miles/24 kilometers Northern terminus: IA 44 in Kimballton Southern terminus: IA 83 northwest of Atlantic Terminus photos Counties: Audubon, Shelby, Cass Cities along route: Kimballton, Elk Horn
	History
	Designated: June 25, 1930, replacing the short lived IA 169 from what was then IA 7 (now IA 44) at Kimballton to Elk Horn Paving history: Unpaved at designation, the original segment was upgraded from bituminous to paved in 1956. The 1980 extension was entirely paved. Major alignment changes: September 23, 1980: Extended southward from Elk Horn to IA 83. (The state took over the segment in Cass County on July 1 and the segment in the city of Elk Horn on July 28; the state took over the remaining segment in Shelby County on September 23.)

Iowa 174

Designated: December 1, 1930
Decommissioned: April 20, 1976
Original northern terminus: IA 2
Original southern terminus: Farragut
Counties: Fremont
Paving history: Unpaved at designation, it was upgraded from bituminous to paved in 1958.
Replaced by: County Road M16

	Iowa 175
	Length: 221 miles/356 kilometers Western terminus: Nebraska state line (Missouri River) east of Decatur, NE; continuation of NE 51 Eastern terminus: US 63 south of Hudson Terminus photos Counties: Monona, Woodbury, Ida, Sac, Calhoun, Webster, Hamilton, Hardin, Grundy, Black Hawk Cities along route: Onawa, Turin, Castana, Mapleton, Danbury, Battle Creek, Ida Grove, Arthur, Odebolt, Lake View, Auburn, Lake City, Lohrville, Gowrie, Harcourt, Dayton, Stratford, Stanhope, Jewell, Ellsworth, Radcliffe, Hubbard, Eldora, Grundy Center, Morrison, Reinbeck NHS: The multiplexed segments with US 59, US 71, US 169, and IA 14 Multiplexes: ½ miles with IA 141 in Mapleton (this is a "wrong-way" concurrency where the two highways run in opposite directions) 3½ miles with US 59 in Ida County through Ida Grove 8 miles with US 71 in Sac County, north and west of Auburn 9 miles with IA 4 in Calhoun County through Lohrville 4 miles with US 169 in Webster County, north and east of Harcourt 1 miles with IA 17 south of Stanhope 2 miles with US 69 south of Jewell 6 miles with US 65 north and east of Hubbard 7 miles with IA 14 west of Grundy Center
	History
	Designated: October 15, 1930, as a spur from US 65 to Hubbard Paving history: The original segment was paved at the time of designation, in conjunction with a US 65 paving project. 1937: Paved segment south of Jewell (multiplexed with US 69) added to highway 1940: Paved segments from Auburn to Lohrville and from Harcourt to Dayton (including the multiplex with US 169) added to highway 1948: Paved segments from Onawa to Turin and from the Woodbury/Ida county line to Auburn (including multiplexes with US 59 and US 71) added to highway 1953: Paved from Mapleton to the Woodbury/Ida county line 1955: Paved from IA 396 south of Farnhamville to IA 53 south of Gowrie (upgraded from bituminous), and from Dayton to Stratford 1956: Paved from Turin to Mapleton 1964: Paved from the Nebraska state line (Missouri River) to Onawa 1967: Segment from Lohrville to IA 396 upgraded from bituminous to paved 1969: Paved segment from Hubbard to US 63 added to highway 1971: Segments from the former IA 53 to US 169 and from Stratford to US 69 south of Jewell (excluding the multiplex with IA 17) upgraded from bituminous to paved 1976: Segment from I-35 east of Ellsworth to US 65 at Hubbard upgraded from bituminous to paved 1978: Multiplexed segment with IA 17 south of Stanhope upgraded from bituminous to paved 1980: Last segment, from US 69 at Jewell to I-35, upgraded from bituminous to paved Major alignment changes: December 1, 1930: Extended westward from US 65 to Radcliffe October 1935 (approved June 4): Extended westward from Radcliffe to Jewell, replacing IA 195 (I) August 1937 (approved June 30): Extended westward from Jewell to Stratford, replacing IA 197 (I) October 1940: Extended westward from Stratford to US 71 at Auburn, superseding all or parts of IA 91 (I), IA 47 (I), IA 287 (I), and IA 188 (II). 1941: Realigned between Gowrie and Harcourt on a new route one mile south of its previous route January 1948 (approved October 28, 1947): Extended westward from Auburn to US 75 at Onawa, superseding IA 35 (I) and sharing part of IA 37 (the duplex was dropped in 1966). This lengthening also created several duplexes with other roads (see above). Summer 1953: Straightened south of Gowrie on a new bituminous segment; IA 53 (III) was created a year later to serve Gowrie. December 19, 1955: Extended into Nebraska on a new bridge across the Missouri River, superseding IA 165 (I). This bridge was a toll bridge operated by the Burt County (NE) Bridge Commission until December 1, 2013, when tolls were dropped after an agreement was reached to transfer the bridge to the states of Iowa and Nebraska. January 1, 1969: Extended eastward from Hubbard to US 63, taking parts of IA 57 and IA 58 with it.

Iowa 176

Designated: August 5, 1930
Decommissioned: July 19, 1972
Original northern terminus: Cumberland
Original southern terminus: IA 2 (I), later IA 92
Counties: Cass
Paving history: Unpaved at designation, it had a bituminous surface at decommissioning (but was paved shortly afterward).
Replaced by: County Road N28, plus city streets (Jackson, 1st, and Main Streets) in Cumberland. It was created after a straightening of IA 2 in the area bypassed Cumberland.

Iowa 177 (I)

Designated: August 5, 1930
Decommissioned: February 2, 1937
Original western terminus: Carson
Original eastern terminus: US 59 south of Oakland
Counties: Pottawattamie
Paving history: There were no paved segments.
Replaced by: Local roads (North, Dye, and Broadway Streets in Carson)

Iowa 177 (II)

Designated: June 8, 1937
Decommissioned: July 1, 1980
Original northern terminus: Mitchell
Original southern terminus: IA 9
Counties: Mitchell
Paving history: Unpaved at designation, it was gravel at the time of decommissioning (but has since been paved)
Replaced by: County Road T28

Iowa 178

Designated: August 5, 1930
Decommissioned: August 11, 1980
Original northern terminus: Little Rock
Original southern terminus: IA 9
Counties: Lyon
Paving history: Unpaved at designation, it was paved in 1937.
Replaced by: Local roads (Main Street in Little Rock and Maple Avenue south of the city limits)

Iowa 179

Designated: August 1930
Decommissioned: July 1, 1980
Original western terminus: US 69
Original eastern terminus: Klemme
Counties: Hancock
Paving history: Unpaved at designation, it was paved in 1936.
Replaced by: Local roads (168th Street plus Main Street in Klemme)

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