Interstate 235 (I-235) in Oklahoma is also known as the Centennial Expressway or the I-235 Central Expressway. The spur route of I-35 is a 5.4-mile-long (8.7 km) north–south alignment in central and north-central Oklahoma City. It connects northbound to U.S. Highway 77 (US-77) to suburban Edmond and southbound at I-44 on to I-35 and the I-40 Crosstown Expressway near downtown Oklahoma City. US-77 is concurrent with I-235 for the entire route. South of its junction with I-40, I-235 becomes I-35.

Quick Facts Route information, Length ...

Interstate 235
Centennial Expressway
I-235 highlighted in red
Route information
Auxiliary route of I-35
Maintained by ODOT
Length	5.36 mi[1] (8.63 km)
Existed	1989[2]–present
NHS	Entire route
Major junctions
South end	I-35 / I-40 / US 62 / US 77 / US 270 in Oklahoma City[3]
North end	I-44 / US 77 / SH-66 in Oklahoma City[4]
Location
Country	United States
State	Oklahoma
Counties	Oklahoma
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Oklahoma State Highway System Interstate US State Turnpikes
← SH-209 → I-240

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I-235's route forms the eastern edge of Automobile Alley, the Deep Deuce residential neighborhood, and the Bricktown Entertainment District, all of which are in the eastern section of downtown Oklahoma City.

The I-235 designation was approved by the American Association of State Highway and Transportation Officials (AASHTO) on July 13, 1976.^[5] Only 3.66 miles (5.89 km) were complete in 1978.^[6] It finally opened in 1989.

Beginning in the mid-1990s, a massive Capital Improvement Project program was started to widen and reconstruct US-77 between Edmond on the Broadway Extension and the North 36th Street exit on I-235. The project included widening to six or eight lanes, reconfiguring several interchanges, and installing a new BNSF Railway bridge over I-235.^[7]

The interchange with I-44/SH-66 was reconstructed from a cloverleaf interchange to a four-level interchange that eliminated two cloverleaf ramps. The other two cloverleafs were widened and reconstructed and two new flyover ramps were added. The four-level interchange is the first of its kind in Oklahoma. The $105 million project lasted three years and was opened on March 3, 2022.^[8] An additional $16 million is being provided to reconstruct the I-44 to US-77 ramp and provide a direct connection to North Lincoln Boulevard. The project is expected to be started in 2023.^[7]

This section does not cite any sources. (October 2022)

The entire route is in Oklahoma City, Oklahoma County.

More information mi, km ...

mi	km	Exit	Destinations	Notes
0.00	0.00		I-35 south / US 77 south / US 62 west – Dallas	Southern terminus; southern end of US-77 concurrency; I-35 exit 126, I-40 exit 151B
		125C	Oklahoma City Boulevard	Exit number based on I-35 mileposts; northbound left exit only; access to Downtown Oklahoma City
		1A	I-35 north / I-40 / US 62 east / US 270 east – Wichita, Ft. Smith	Southbound left exit and northbound entrance
		1B	I-40 / US 270 west – Amarillo
0.43	0.69	1C	Sheridan Avenue – Downtown	Northbound exit only
			Oklahoma City Boulevard	Southbound exit only
0.65	1.05	1D	Lincoln Boulevard – Oklahoma Health Center, State Capitol	Northbound exit and southbound entrance
1.13	1.82	1E	Harrison Avenue / N. 10th Street	No southbound exit; access to Oklahoma City National Memorial
		1F	N. 6th Street / Walnut Avenue	No northbound exit
1.40	2.25	1G	N. 10th Street – Oklahoma Health Center	Southbound exit and northbound entrance
2.32	3.73	2	N. 23rd Street / Santa Fe Avenue	Northbound exit and southbound entrance
2.64	4.25	2	N. 23rd Street / Broadway Avenue – State Capitol	Southbound exit and northbound entrance
3.53	5.68	3	N. 36th Street
5.05	8.13	4	I-44 (SH-66) / Santa Fe Avenue / N. 50th Street – Lawton, Tulsa	Signed as exits 4A (west) and 4B (east); exits unnumbered southbound; I-44 west exit 127, east exits 127A-B; northbound exit and southbound entrance
5.36	8.63	—	US 77 north – Edmond	Northern terminus; northern end of US-77 concurrency
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

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