Interstate 70

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K-10 at I-70/Kansas Turnpike - Lawrence

Interstate 70 (Kansas Turnpike) west from Exit 197 for K-10 (S Lawrence Trafficway) at Lawrence. 10/06/21

K-10 at I-70/Kansas Turnpike - Lawrence

Interstate 70 (Kansas Turnpike) east from the parclo A2 interchange (Exit 197) with the west end of K-10 (S Lawrence Trafficway) at Lawrence. 10/06/21

Traversing 423.77 miles across the width of the Sunflower State, Interstate 70 joins Denver, Colorado with Kansas City. The freeway replaced U.S. 24 from Burlington, Colorado east to Levant and U.S. 40 from Oakley to Topeka. U.S. 24 and U.S. 40 parallel Interstate 70 as it joins the Kansas Turnpike from the capital city east to Bonner Springs in Leavenworth County. U.S. 24 and U.S. 40 rejoin the route east into Kansas City, Missouri.

Interstate 70 Kansas Guides

Forming part of a transcontinental trucking corridor, Interstate 70 joins the cities of Colby, Hays, Salina and Junction City across Kansas. The tolled portion of the Kansas Turnpike overlays 40.16 miles of I-70 between I-470 and U.S. 24-40-73/K-7 at Bonner Springs, serving Lawrence midway. The turnpike formally extends east along Interstate 70 to the 18th Street Expressway (Exit 420).

K-18 at I-70/US 40 - Fort Riley, KS

K-18 combines with I-70/U.S. 40 west to Grandview Plaza and Junction City in Geary County, Kansas. 10/06/21

K-18 at I-70/US 40 - Fort Riley, KS

Leading away from K-18 near Fort Riley, I-70/U.S. 40 traverse the Flint Hills region east toward Topeka, Kansas. 10/06/21

Through Downtown Topeka, I-70-U.S. 40/K-4 elevate along the Polk-Quincy Viaduct before dropping below grade between Monroe and Madison Streets. The narrow four lane bridge system curves eastward from 1st and Polk Streets to 2nd and Quincy Streets above the city street grid. Long range plans outline the replacement of the four lane Polk-Quincy Viaduct into separate bridges for east and westbound traffic.

Polk-Quincy Viaduct

The Polk-Quincy Viaduct Study preferred alternative also outlines a new ramp system, with split diamond interchanges outlined for Van Buren and Jackson Streets to the north and with the Monroe and Madison Street couplet to the east. 2014-15 repair work extended the lifespan of the viaduct built in the early 1960s, and additional maintenance in 2022 will keep the elevated roadway operational. Initial design work commenced in Fall 2016 and the Topeka City Council granted KDOT authority to purchase the estimated $16 million in needed right of way for the project in July 2016.1

Costs for the Polk-Quincy Viaduct Project were estimated at $234 million in July 2021. A formal funding partnership agreement for the project was signed by Governor Laura Kelly on October 13, 2021. Final property acquisition for the Polk-Quincy Viaduct project continued through Fall 2021. The anticipated construction letting is 2024.

Kansas Turnpike

A major project reconfigured the East Topeka interchange of the Kansas Turnpike, where Interstate 70 overtakes Interstate 335 along the toll road mainline east toward Lawrence, starting in 1997. Costing $94 million, it was one of the largest highway projects in state history at the time. Work extended the I-70 mainline east to a new wye interchange with the turnpike, replacing an access road and trumpet road system to the south. Ramps were also added to the Oakland Expressway (K-4 and U.S. 40), which ties into Interstates 70 and 335 from U.S. 24 to the north. The system interchange fully opened to traffic on August 1, 2001, with side work at the Rice Road exit from I-70 and for the removal of the old toll booths continuing until late 2002.2

A 12.69 mile section of the turnpike, between the East Topeka and Lecompton interchanges, was expanded to six lanes as part of a $108.6 million project between 2003 and May 2007.3 Construction commenced further east at Lawrence to replace the 1950s-built bridges over the Kansas River following a ground breaking ceremony held on May 22, 2008. The $140 million project initially added a new three lane bridge to the north of the original spans by late 2009. Subsequent work through 2011 removed the old bridges and built the new three-lane eastbound span.4

Ground breaking for construction of the Kansas Turnpike took place on December 31, 1954. Tolls were implemented along the Kansas Turnpike section of I-70 east to the Turner Diagonal Freeway (Exit 415) until the early 1980s, when the Eastern Terminal was relocated from a toll plaza located east of 78th Street, westward to the Bonner Springs interchange. An agreement made between the federal government and Kansas Turnpike Authority (KTA) in 1973 called for the elimination of tolls east of Bonner Springs as plans emerged to construct the interchange with Interstate 435. Bond fees for the original turnpike were paid off on October 1, 1994, coinciding with the suspension of tolls for drivers entering I-70 east from K-7 at Exit 224.5

I-70/US 24-40-169 at Central Av - Kansas City, KS

I-70/U.S. 24-40-169 between Central Avenue and the west end of Interstate 670 in Kansas City, Kansas. 10/31/16

Lewis and Clark Viaduct

Interstate 70 travels across a series of nine bridges from Riverview in Kansas City to the Missouri state line at the West Bottoms area. Collectively the elevated roadway is named the Lewis and Clark Viaduct. The origins of the bridge network date to 1905, when a groundbreaking ceremony was held for the Intercity Viaduct, a four lane, two level deck truss bridge. The span opened in 1907 as a toll bridge.6

Tolls were dropped on the Intercity Viaduct in 1918 when the city took over control of the bridge system. Work converted the lower level to a two lane automobile deck in 1930, and the removal of streetcar lines in 1936 converted the upper deck for four lanes of traffic. The Lewis and Clark Viaduct was constructed to the north in 1962 for westbound traffic.6

The original eastbound span was formally renamed also as the Lewis and Clark Viaduct on January 25, 1969. The lower deck of the span across the Kansas River was rehabilitated for bicycle and pedestrian use in 1999-2000.6 A study was undertaken by KDOT in 2012 for the rehabilitation or replacement of the viaduct system and associated roadways.

Ultimately a $65 million project was authorized to replace a 0.58 mile long section of the Lewis and Clark Viaduct westbound. Work to demolish the existing span and erect nine plate girder spans and 11 precast girder spans got underway in early 2018.7 Delayed by heavy flooding in 2019, the new elevated roadway opened to traffic on January 23, 2021, a year later then planned.8

Phase 2 of the Lewis & Clark Viaduct reconstruction will replace the eastbound bridge. Phase 3 will add flyovers along Interstate 70 westbound over the Kansas River.8

Interstate 70 scenes
Ohio Street north at I-70/U.S. 40 in northeastern reaches of Salina. 11/01/16
The diamond interchange (Exit 253) with Ohio Street is one of three Salina area exits along Interstate 70. 11/01/16
Solomon Road south meets I-70/U.S. 40 on the north side of the Solomon city limits at Exit 266. 10/17/04
Prior to 2013, Poplar Street south from Solomon Road and the exchange with I-70/U.S. 40 into Solomon was designated K-221. 10/17/04
Halstead Road south at the diamond interchange (Exit 249) with I-70/U.S. 40 in Saline County. 11/01/16
Interstate 70 continues east from Halstead Road to meet the north end of I-135 and U.S. 81 at Exit 250. 11/01/16
Valencia Road north meets I-70/U.S. 40 at Exit 350 in Dover township west of Topeka. 11/04/03
Originally a diamond interchange joined Valencia Road with I-70/U.S. 40. The westbound ramps were realigned to intersect Highway 40, the north service road. 11/04/03
A loop ramp joins Valencia Road with I-70/U.S. 40 west toward Manhattan and Junction City. 11/04/03
Wanamaker Road north at I-70/U.S. 40-75 and K-4 in Topeka. Originally a half cloverleaf interchange joined the arterial and freeway here. 10/31/16
The exchange at Wanamaker Road was reconfigured into a folded diamond to accommodate new ramps joining U.S. 75 with I-470 to the west. 10/31/16
A loop ramp joins Wanamaker Road northbound with I-70-U.S. 40/K-4 west just ahead of the split with U.S. 75 south. 10/31/16
U.S. 75 partitions with Interstate 70 at the succeeding exit east of Fairlawn Road in Topeka. 06/19/15
The separate exchanges at SW 6th Avenue and Fairlawn Road were consolidated into a single diamond interchange with I-70 and U.S. 40/75-K4. 06/19/15
Fairlawn Road north at SW 6th Avenue in the West Southwest area of Wichita. A split diamond interchange previously joined SW 6th Avenue with I-70 to the west and Fairlawn Road with I-70 to the north. 06/19/15
110th Street stems south from Speedway Boulevard and Village West Parkway to Interstate 70 (Kansas Turnpike) at Exit 410. 06/18/15
110th Street links Kansas Speedway and Hollywood Casino with I-70 leading into Kansas City. 06/18/15
U.S. 24/40 combine with Interstate 70 from U.S. 73 and K-7, the exit west of 110th Street at Bonner Springs, east to Kansas City, Missouri. 06/18/15
N 78th Street northbound at the westbound entrance ramp for I-70/U.S. 24-40 at Victory Hills in Kansas City. 10/06/21
Central Avenue west at the parclo interchange with I-70/U.S. 24-40-169 at the Riverview neighborhood in Kansas City, Kansas. 11/03/16

  1. "Design work delayed until fall on I-70 viaduct through downtown." Topeka Capital-Journal, The (KS), July 28, 2016.
  2. "New interchange opening - $94-million project will open more direct routes for Topeka commuters." Journal-World (Lawrence, KS), August 1, 2001.
  3. "Turnpike being reconfigured." Topeka Capital-Journal, The (KS), December 22, 2005.
  4. "Turnpike replacing bridges at Lawrence." Topeka Capital-Journal, The (KS), May 23, 2008.
  5. "A fare's farewell The 440-yard drive from Interstate 70 to Kansas 7 in Bonner Springs now costs drivers 35 cents. Starting Oct. 1, 1994 it will be free." The Kansas City Star, June 4, 1992.
  6. Lewis & Clark Viaduct Study History Page, Kansas Department of Transportation.
  7. Lewis and Clark Viaduct (I-70). American Bridge Company, project archive.
  8. "Governor Laura Kelly Announces Completion of $65 Million Transportation Project." Kansas Office of the Governor, press release. March 15, 2021.

Photo Credits:

  • 11/04/03 by Justin Cozart.
  • 10/17/04 by AARoads.
  • 06/18/15 by AARoads.
  • 06/19/15 by AARoads.
  • 10/31/16 by AARoads and JP Nasiatka.
  • 11/01/16 by AARoads and JP Nasiatka.
  • 11/03/16 by AARoads.
  • 10/06/21 by AARoads.

Connect with:
Interstate 35
Interstate 135
Interstate 335 - Kansas turnpike
Interstate 435
Interstate 470
Interstate 635
U.S. 24
U.S. 40
U.S. 69
U.S. 75
U.S. 81
Highway 7
Highway 10

Page Updated 11-10-2021.

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